Research Radartracking 11 published studies · 7 human · 9 clinical trials · 13 cancer pages · updated Jun 2026Open the Research Map →
Diet

Low-glycemic diet

Eating patterns that limit blood-sugar spikes, studied in cancer risk and metabolism.

Educational only. This page reports what published guidelines and studies describe. It is not medical advice and is not a claim that low-glycemic diet treats, prevents, or cures cancer. Decisions are yours and your care team's.

What the studies report: a cited, human-reviewed summary, kept current as the evidence changes and retracted findings are removed.

Reviewed Jun 2026 · OncoForge editorial · How we review →

Evidence at a glanceNo graded study evidence yet
138 source documents in the Low-glycemic diet corpus

last checked June 9, 2026

Key points

  • Overview: The sources define low-glycemic eating mainly by lower glycemic index (GI) and glycemic load (GL), and they discuss it mostly in observational cancer epidemiology rather than as a cancer treatment. In breast cancer, higher GI was associated with higher risk in one 2025 meta-analysis, while GL and sugar were not clearly associated and fiber showed an inverse pattern.

6 sections — tap any heading to expand its cited detail. Key points are above.

OverviewThe sources define low-glycemic eating mainly by lower glycemic index (GI) and glycemic load (GL), and they discuss it mostly in observational cancer epidemiology rather than as a cancer treatment. In breast cancer, higher GI was associated with higher risk in one 2025 meta-analysis, while GL and sugar were not clearly associated and fiber showed an inverse pattern.11 points
  • Sources describe low-glycemic eating mainly in terms of lower glycemic index (GI) and glycemic load (GL); GI reflects a food's effect on postprandial blood glucose, and some sources describe GI and GL as markers of carbohydrate quality. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]
  • The evidence base in the sources is mostly observational meta-analyses and reviews, with no randomized cancer outcome trials in the corpus. [1][2][24][25][3][26][27][28][29][30][31]
  • A 2025 meta-analysis reported that higher dietary glycemic index was associated with higher breast cancer risk, while glycemic load was not clearly associated. [32]
  • The same meta-analysis reported no clear association for dietary sugar and a borderline inverse association for total dietary fiber, with a stronger inverse association for fiber in premenopausal women. [32]
  • A 2025 systematic review of studies from the MENA region reported mixed findings for fruit and vegetable intake and breast cancer risk. [33]
  • Some studies in the MENA review found lower breast cancer risk with higher fruit and vegetable intake, while others found no significant association for fruit, vegetables, or both. [33]
  • Across the included meta-analyses, high GI was associated with a modestly higher risk of breast cancer in some pooled analyses, while endometrial cancer findings were not consistent for GI and several other cancer sites showed no clear association. [34][35][36][37][38][39]
  • Across the included meta-analyses, high GL was associated with a modestly higher risk of endometrial cancer in pooled analyses, while breast, colorectal, colon, and pancreatic cancer analyses did not show a significant association. [35][36][37][38][39][34]
  • A 2025 review on hepatocellular carcinoma reported that foods with high glycemic load were associated with higher HCC risk. [40]
  • A 2025 cohort study in lung cancer reported that higher dietary glycemic index was associated with higher lung cancer risk, while higher dietary glycemic load was associated with lower lung cancer risk. [41]
  • The sources describe low-glycemic diets mainly as diets with lower glycemic index, sometimes within broader carbohydrate-quality patterns, and they study these patterns in relation to cancer risk, prognosis, metabolic factors, and in one mouse model of tumor growth. [42][43][44][10][11][45][46][47][48][49][14][50][51][52][53][54][18][19][20][22][23][55][56]
Proposed mechanismsProposed mechanisms for low-glycemic diets in cancer focus on lower post-meal glucose and insulin exposure, with downstream effects on insulin resistance, inflammation, and insulin-like growth factor signaling. Other proposed pathways include oxidative stress, gut microbiota changes, and effects of dietary fiber, whole grains, resistant starch, and polyphenols on carbohydrate digestion and metabolism.66 points
  • High glycemic intake can cause postprandial blood sugar spikes and increased insulin secretion, and recurrent responses can lead to insulin resistance and inflammation. [57]
  • Low-grade inflammation can coexist with insulin resistance and contribute to cellular damage and tumorigenesis. [57]
  • White rice intake can significantly increase glycemic load. [26]
  • High carbohydrate intake changes the insulin-like growth factor I pathway and produces oxidative stress and cell proliferation, which the authors discuss as possible links to cancer. [30]
  • High GI and GL diets are believed to be associated with cancer risk through increases in serum glucose or insulin levels. [7]
  • Glycemic index is an indicator of the quality of carbohydrate foods. [8]
  • Long-term high GI or GL intake may lead to chronically high blood glucose and elevated insulin, and insulin and IGF-1 are described as possible links to cancer development. [4]
  • The randomized-trial meta-analysis found no significant effect of low-GI or low-GL diets on hs-CRP, TNF-α, leptin, or IL-6 in adults. [58]
  • High glycemic index and glycemic load are described as proxies for chronic hyperinsulinemia in the context of breast cancer etiology. [59]
  • Carbohydrates and GI may influence insulin secretion and insulin-like growth factors. [36]
  • Hyperinsulinemia is a hypothesized pathway linking carbohydrate, GI, and GL to colorectal cancer risk. [39]
  • Sucrose-rich diets caused mutations in rat colon epithelium in vivo, and several biological mechanisms were hypothesized. [38]
  • High GI and GL may influence cancer risk through hyperinsulinemia and the insulin-like growth factor axis. [1]
  • Higher postprandial glycemia is a proposed universal mechanism for disease progression. [2]
  • Dietary fiber and whole-grain intake appeared to be the main carbohydrate quality index components driving the observed associations in the older-adult mortality study. [15]
  • Adding Pleurotus eryngii powder was intended to increase dietary fiber, and the product was evaluated for glycaemic index and simulated gastrointestinal digestion. [60]
  • Pleurotus eryngii contains bioactive compounds such as polyphenols, β-glucans, and ergothioneine, which were linked in the paper to antioxidant and immunomodulatory properties. [60]
  • Low-grade chronic inflammation, insulin resistance, and gut microbiota changes are proposed mechanisms linking Western-pattern diets to liver carcinogenesis. [40]
  • Rapidly digestible starch can cause sharp increases in blood sugar levels, while resistant starch can support gut microbes and produce short-chain fatty acids. [61]
  • Polyphenol-starch complexes may reduce starch digestibility and in vitro glycemic index, and they are described as a possible new resistant starch type 6. [61]
  • Vegetables, legumes, fruits, and whole grain-derived products could provide fiber, polyphenols, and low-glycemic index carbohydrates. [40]
  • High glycemic meals may initially raise blood glucose and insulin levels and later trigger insulin resistance with increased free fatty acids. [42]
  • The biological basis for links between sugar-related dietary patterns and breast cancer may involve elevated estrogen levels, pro-inflammatory molecules, and impaired glucose metabolism. [43]
  • Obesity-related factors such as chronic low-grade inflammation and hyperinsulinemia may contribute to carcinogenesis. [43]
  • In one mouse study, the low-GI group had lower glucose and insulin than the high-GI group, but these differences were not statistically significant. [10][11]
  • A low-glycemic-index diet may alter the insulin/IGF-1 axis and body composition without changing tumor growth. [10]
  • Glucose conditions affected NRP1, AKT, NF-kB, TP53, invasion, apoptosis, and clonogenicity in resistant breast cancer cells. [45]
  • Low glycemic index is one component of a cholesterol-lowering dietary pattern that also included fiber, MUFA, legumes, low SFA, plant oils, and low cholesterol intake. [11]
  • RS3 can be used to produce low-glycemic-index foods and is described as regulating blood glucose. [12]
  • Sources describe glycemic index/load as reflecting effects on postprandial glucose, and one review proposes that high-GI/GL diets may affect cancer partly through adverse effects on insulin metabolism, including hyperinsulinemia and insulin resistance. [13][14][49]
  • High glycemic index or glycemic load diets may be linked to hyperinsulinemia, insulin resistance, inflammation, oxidative stress, and changes in insulin-like growth factor signaling. [14]
  • The relationship between pancreatic cancer and glucose regulation is bidirectional, with PDAC able to cause pancreatogenic diabetes. [49]
  • Food-related factors such as intact cereal grains, leguminous seed structure, low processing, and pasta protein networks can lower glycemic index. [13]
  • White clover flower enrichment lowered rapidly digestible starch, rapidly available glucose, and calculated in vitro glycemic index while increasing resistant starch and slowly digestible starch. [62]
  • White-clover-flower-enriched muffins had higher total polyphenol content and antioxidant activity than control muffins. [62]
  • High glycemic index and glycemic load are linked to hyperinsulinemia, lower IGF binding proteins, higher free IGF-1, and inflammatory mediators that may promote a tumor-favorable microenvironment. [63]
  • Low glycemic index carbohydrates are used in dietary management to reduce hypoglycemic symptoms or progression of dumping syndrome. [64]
  • Dietary fiber may lower glycemic index and glycemic load and improve insulin sensitivity, which may favorably regulate IGF-1. [63]
  • Dietary fiber can slow glucose absorption in the small intestine and reduce the glycemic index of food. [65]
  • Dietary fiber can interact with gut microbiota and produce short-chain fatty acids through fermentation. [65]
  • Low-glycemic dietary patterns are discussed in relation to lower post-prandial glucose and insulin responses, and proposed mechanisms include hyperglycemia, hyperinsulinemia, high IGF-1, high circulating estrogen, inflammation, and impaired cellular differentiation/apoptosis. [66]
  • Insulin-related pathways, IGF signaling, adipokines, inflammatory cytokines, and aromatase-related estrogen production are involved in the proposed biology connecting diet and breast cancer. [66]
  • Low-glycemic patterns are intended to reduce post-meal blood glucose and insulin responses compared with higher-glycemic patterns. [54]
  • Sources describe insulin/IGF-1 signaling as linked to cancer metabolism, and tumor/host metabolism as influencing antitumor immune response. [53][52]
  • Glucose deprivation in the tumor microenvironment can inhibit glycolysis in immune cells and impair antitumor immune responses. [52]
  • Glucose can directly influence IGF-1 gene transcription in the liver, and diet and nutrition can influence IGF-1 production and secretion. [53]
  • IGF-1 concentrations increase under high-protein and high-fat diets and decrease in diets rich in carbohydrates. [53]
  • Simple carbohydrates may increase cancer risk through activation of the insulin/IGF-1 axis and aerobic glycolysis, while complex carbohydrates may act through different endocrine and microbiome-related pathways. [18]
  • Gemcitabine efficacy increased when insulin-like growth factor signaling was inhibited, and this was used to argue that glycemic index may matter in PDAC management. [19]
  • High glycemic index diets intensify liver steatosis by increasing lipogenesis and triglyceride deposition in hepatocytes. [20]
  • Resistant starch has direct effects on postprandial blood glucose, serum cholesterol, and glycemic index. [67]
  • The main mechanism proposed for associations between high dietary glycemic index or glycemic load and cancer is chronic hyperinsulinemia. [68]
  • Insulin is a mitogen and increases the bioactivity of insulin-like growth factors, which can promote cancer by inhibiting apoptosis and stimulating cell proliferation. [68]
  • Resistant starch consumption was associated with reduced abdominal fat and improved insulin sensitivity. [69]
  • Fermentation of resistant starch in rodent studies was associated with increased short-chain fatty acids, changes in the microbiota, and increased gene expression for products involved in normal healthy proliferation and apoptosis of potential cancer cells. [69]
  • Diets low in glycemic index and glycemic load should be considered together with fiber and whole grain content. [21]
  • One source states that low-glycemic-index, high-fiber foods decrease insulin resistance and diabetes risk, and another review says chronic hyperinsulinemia is thought to be a mechanism linking high-GI/GL diets with some cancers. [70][71]
  • Insulin may increase estrogen bioavailability, and hyperinsulinemia may increase proinflammatory cytokines and oxidative stress. [70]
  • Pulses contain phytochemicals, saponins, and tannins with antioxidant and anti-carcinogenic effects. [72]
  • Low glycemic index and glycemic load may act together with fiber and antioxidant compounds as part of a favorable health pattern. [73]
  • Sourdough fermentation lowers the glycemic index of bread by reducing starch digestibility, and organic acids, amylolytic enzyme inhibition, reduced starch bioavailability, and delayed gastric emptying are proposed mechanisms. [71]
  • Glycemic index and glycemic load are among dietary factors with established influences on inflammatory markers. [74]
  • Weight loss may be a common mechanism linking dietary interventions, including a low-glycemic index diet, to changes in tumor biology. [75]
  • Lower glycemic index is one proposed mechanism by which habitual whole grain consumption may be associated with lower body weight. [76]
  • Low glycemic load may be linked to lower cancer risk through multiple mechanisms, including reduced oxidative stress. [77]
  • Glycemic index is a measure of a food's effect on postprandial blood glucose concentrations. [22][23]
What we don't know yetThe evidence on low-glycemic dietary patterns and cancer is inconsistent across studies and cancer types. No source in this set provides cancer-treatment trial data or establishes effects on survival, recurrence, or survivorship outcomes.57 points
  • The evidence for glycemic load and sugar was not clear in a 2025 breast cancer meta-analysis, and a 2025 MENA review reported mixed findings for dietary patterns related to fruit and vegetable intake. [32][33]
  • A 2026 gut microbiota meta-analysis reported contradictory conclusions across studies and few studies on gut flora and PCOS-related clinical phenotypes. [78]
  • The sources note that evidence is inconsistent across cancer types and that more prospective studies are needed. [26][28][29][30]
  • The mortality meta-analysis reported that the association between glycemic load and cancer mortality differed by sex. [28]
  • The hepatocellular carcinoma meta-analysis found no significant association for GI or GL in the general population but a positive association for high GL in HBV or HCV-positive subgroups. [27]
  • The lung cancer meta-analyses reported a significant association for GI but not for GL, and the esophageal cancer review listed high GI foods among regional dietary risk factors. [29][30][27][31]
  • The umbrella review said further research is needed to add evidence for the relation of dietary GI and GL with cancer risk. [5]
  • The 2022 cancer meta-analysis noted considerable inconsistency in results across studies of GI and GL. [6]
  • The 2021 review concluded that more cohort studies are required for insulin index and insulin load in relation to cancer risk. [7]
  • The bladder cancer meta-analysis reported that the role of glycemic index or glycemic load is not consistent across human malignancies. [8]
  • The 2020 endometrial-cancer meta-analysis said the overall associations of total carbohydrate intake, GI, and GL with endometrial cancer risk were not significant, but some subgroup and dose-response findings were positive. [79]
  • The 2019 cancer-risk meta-analysis said evidence for GI and GL and cancer risk was still weak and that other summary relative risks were not significantly above unity for most cancer sites. [4]
  • The randomized-trial meta-analysis said additional randomized trials, particularly feeding trials, are required to clarify effects on inflammatory biomarkers. [58]
  • The 2017 breast cancer meta-analysis said the dose-response associations remain inconclusive overall and that menopausal status and hormone receptor status may influence the associations. [80]
  • The 2017 breast cancer meta-analysis reported a slightly stronger association for glycemic index among postmenopausal women than among premenopausal women, but the difference was not statistically significant. [80]
  • The 2017 breast cancer meta-analysis reported positive associations for glycemic load and carbohydrate intake among postmenopausal women with estrogen-negative tumors. [80]
  • The 2015 cancer meta-analysis noted that significant heterogeneity among studies was observed in most site-specific analyses. [81]
  • Sources describe uncertainty or inconsistency across studies for some cancers, while reporting positive associations for certain cancer sites such as endometrial cancer with glycemic load and breast cancer with glycemic index. [35][36][37][38][39][34]
  • The pancreatic cancer meta-analysis said the increased risk finding for fructose intake warrants further investigation in studies with better confounding adjustment and in non-American populations. [37]
  • The endometrial cancer meta-analysis reported significant heterogeneity by study design for GI, with cohort studies showing RR 1.00 and case-control studies showing RR 1.56. [35]
  • Sources say carbohydrate quality and some mortality outcomes remain unclear, and that associations with glycemic index or glycemic load and cancer mortality were not clear or not significant in the cited cohorts. [15][16]
  • The HCC review states that little is known about the role of dietary habits in modulating HCC risk. [40]
  • The lung-cancer cohort reports that study results on dietary glycemic index and glycemic load have been inconsistent. [41]
  • The starch and polyphenol review says that research on polyphenol-starch complexes is limited and that comparisons across studies are not feasible because methods differ. [61]
  • The reviews state that more well-designed prospective studies and randomized trials are needed to clarify the association between glycemic index, glycemic load, and breast cancer. [43]
  • The 2024 commentary also notes that observational data limit causal inference for glycemic index and glycemic load findings. [42]
  • The breast-cancer review says future studies should examine different sugar types, sources, dietary patterns, and menopausal or receptor subgroups. [43]
  • The prostate xenograft study says human studies on glycemic index and prostate cancer risk have mixed findings. [10]
  • The prostate xenograft study says the extent of glycemic-index modification, the mechanisms behind it, and the association with cancer progression remain unknown. [10]
  • The hormone-related cancer review states that findings on glycemic index and glycemic load are mixed across cancer types and study populations. [14]
  • The scoping review says there is limited evidence for some carbohydrate-related health outcomes, and that GI and GL are related to health outcomes with limited evidence. [13]
  • The white clover muffin study was an in vitro food study and did not test cancer outcomes in people. [62]
  • The ovarian cancer study says no study had previously evaluated the relation between the diabetes risk reduction diet and ovarian cancer before that investigation, and that evidence on diet and ovarian cancer risk is not conclusive. [63]
  • The ovarian cancer study also notes that studies of glycemic index and glycemic load have shown mixed results. [63]
  • The endometrial cancer scoping review says further research is needed on nutrition, obesity, and inflammation in relation to endometrial cancer development. [82]
  • The provided sources do not establish whether a low-glycemic diet has a consistent cancer-related effect across different cancer types. [63][82][64][83][84][85]
  • The survivorship review states that there is still a lack of evidence to identify the best dietary strategy after breast cancer diagnosis. [66]
  • The breast cancer review notes that evidence for the relation between dietary glycemic index or glycemic load and breast cancer is mixed, including a meta-analysis showing only a modest association and another analysis finding no significant association in a high-risk cohort. [66]
  • The millets review presents anti-cancer findings from laboratory and animal studies, including effects on colorectal, breast, liver, and leukemia models, but these are preclinical observations rather than clinical outcome data. [65]
  • The endometrial cancer review says the evidence for glycemic load and endometrial cancer risk is still not fully consistent. [50]
  • The glycemic index review says the effects of low-glycemic diets on cognition in healthy adults remain unclear. [54]
  • The immune-metabolism review says the most effective way to change glucose use by immune cells in the tumor microenvironment is not established. [52]
  • The breast cancer prognosis review says data are lacking on specific lifestyle modifications to prevent or treat metabolic abnormalities in women with breast cancer to improve survival. [51]
  • The carbohydrate review stated that more prospective studies and randomized trials are needed to clarify the long-term relationship between carbohydrate intake and cancer progression and prognosis. [18]
  • The carbohydrate review also stated that data on tertiary prevention, including recurrence and mortality, have been limited. [18]
  • The PDAC review presented dietary glycemic index as a topic of interest in pancreatic cancer management, but the excerpt provided does not show clinical trial results for a low-glycemic diet itself. [19]
  • The resistant starch review stated that further research is needed on resistant starch, including challenges and perspectives for future work. [67]
  • The cancer overview review says positive associations between dietary glycemic index or glycemic load and cancer risk were found more frequently in case-control studies than in cohort studies. [68]
  • The consensus review says moderate-to-weak associations were observed for selected cancers, indicating that the evidence base is not uniform across cancer types. [21][68]
  • The pulses review says long-term randomized controlled trials are needed to demonstrate direct effects of pulses on chronic diseases. [72]
  • The breast-cancer review says there has been no randomized trial that clearly demonstrated that lifestyle changes decrease breast cancer risk. [70]
  • The breast-cancer review says systematic reviews and meta-analyses reported conflicting results regarding the cancer sites involved. [71][70]
  • The Mediterranean-diet review notes that the relationship between dietary intake and disease is complex and cannot be reduced to a single nutrient or food. [73]
  • The prostate cancer review said that larger and longer-term studies are needed to determine the clinical relevance of low-glycemic index diet findings. [75]
  • The sources say that inconsistencies in the findings still need to be resolved. [22]
  • The sources also note that glycemic index methodology is not well standardized and has several flaws, which limits interpretation of the evidence. [23]
  • One review says that the main component or components responsible for the favorable cancer-related associations of vegetable- and fruit-rich diets remain undefined. [56]
What studies reportStudies on low-glycemic diets and cancer report mixed findings across cancer types. Some meta-analyses and cohort studies describe positive associations for glycemic index or glycemic load in breast, colorectal, endometrial, lung, prostate, bladder, and ovarian cancer, while other analyses report null or inconsistent results.98 points
  • A 2023 meta-analysis found no significant association between white rice intake and cancer risk. [26]
  • A 2023 meta-analysis found no significant association between GI, GL, or daily carbohydrate intake and hepatocellular carcinoma risk in the general population, but a high GL diet was associated with higher HCC risk in people with hepatitis B virus or hepatitis C virus infection. [27]
  • A 2022 meta-analysis found a higher risk of lung cancer with higher GI intake, while GL was not significantly associated with lung cancer risk. [29][30]
  • A 2022 lung cancer meta-analysis reported a curvilinear dose-response relationship between GI and lung cancer risk. [30]
  • A 2023 mortality meta-analysis found higher all-cause mortality and stroke mortality with higher GI, and higher CVD mortality and stroke mortality with higher GL. [28]
  • A 2022 review of esophageal cancer risk factors listed foods with high glycemic index among dietary risk factors reported across regions. [31]
  • A 2022 umbrella review reported a positive association between dietary GI and the risk of colorectal, breast, and bladder cancers, and a positive association between dietary GL and the risk of coronary heart disease, type 2 diabetes, and stroke. [5]
  • A 2022 meta-analysis reported that high GI diet was associated with a small increase in overall cancer risk, with low certainty of evidence. [6]
  • The same 2022 meta-analysis reported that high GI diet was associated with higher risks of lung cancer, breast cancer, and bladder cancer, while dietary GL was inversely associated with lung cancer risk. [6]
  • A 2021 systematic review of cohort studies concluded that there was a weak association between dietary GI/GL and diabetes-related cancer risk and no association between insulin index/load and cancer risk. [7]
  • A 2020 meta-analysis of bladder cancer studies reported a significant positive association between dietary GI and bladder cancer risk, but no association for carbohydrate intake or GL. [8]
  • A 2020 meta-analysis of prostate cancer studies reported a significant positive dose-response association between dietary GI and prostate cancer, but no significant association for GL. [9]
  • In a 2020 dose-response meta-analysis of observational studies, higher dietary GI and GL were reported to have positive associations with endometrial cancer risk in some subgroups and in dose-response analyses, while the overall associations were not significant. [79]
  • In the 2019 updated meta-analysis, higher GI and GL were reported to be associated with colorectal cancer risk in some analyses, while other cancer-site estimates were not significantly above unity. [4]
  • For breast cancer, the updated meta-analysis reported null associations for GI and GL in several cohort and case-control studies. [4]
  • For endometrial cancer, the updated meta-analysis also reported null associations in two studies, despite the broader meta-analysis finding positive associations in some subgroups. [79][4]
  • In a 2017 dose-response meta-analysis of prospective studies, glycemic index was associated with breast cancer risk with a summary RR of 1.04 per 10 units/day, while glycemic load and carbohydrate intake were not clearly associated overall. [80]
  • In a 2016 meta-analysis restricted to prospective cohort studies, a high glycemic index dietary pattern was associated with a summary relative risk of 1.05 for breast cancer and a high glycemic load dietary pattern was associated with a summary relative risk of 1.06. [59]
  • In a 2015 meta-analysis of observational studies across cancer sites, high glycemic index and high glycemic load were reported as being related to moderately increased cancer risk at several common sites. [81]
  • In that 2015 meta-analysis, the summary relative risks for breast cancer were 1.05 for glycemic index and 1.07 for glycemic load, and for prostate cancer they were 1.06 and 1.04, respectively. [81]
  • In a 2016 meta-analysis of prostate cancer dietary patterns, a carbohydrate pattern was reported to be associated with a significant increase in prostate cancer risk, but the excerpt provided does not include the pooled estimate. [86]
  • In the 2013 endometrial cancer meta-analysis, the pooled risk estimate for the highest versus the lowest GI intake category was 1.15 (95% CI 0.95-1.40). [35]
  • In the 2013 endometrial cancer meta-analysis, the pooled risk estimate for the highest versus the lowest GL intake category was 1.21 (95% CI 1.09-1.33), and the dose-response estimate for GL was 1.06 per 50 unit/day increment (95% CI 1.01-1.11). [35]
  • In the 2012 pancreatic cancer meta-analysis, the summary relative risk per 10 GI units was 1.02 (95% CI 0.93-1.12), and the summary relative risk per 50 GL units was 1.03 (95% CI 0.93-1.14). [37]
  • In the 2012 colorectal cancer cohort meta-analysis, the summary relative risk for high versus low GI intake was 1.07 (95% CI 0.99-1.16), and the summary relative risk for high versus low GL intake was 1.00 (95% CI 0.91-1.10). [39]
  • In the 2011 breast cancer meta-analysis, the summary relative risk for the highest versus the lowest GI intake was 1.08 (95% CI 1.02-1.14), and the summary relative risk for GL was 1.04 (95% CI 0.95-1.15). [34]
  • In the 2013 endometrial cancer meta-analysis, the pooled risk estimate for the highest versus the lowest GI intake was 1.09 (95% CI 0.92-1.29) in the updated meta-analysis from the Italian study, and the pooled risk estimate for the highest versus the lowest GL intake was 1.19 (95% CI 1.06-1.34). [36]
  • A 2008 meta-analysis reported that higher GI was associated with a modestly higher breast cancer risk in validated prospective studies. [2]
  • A 2009 meta-analysis found no association between GI or GL and colorectal cancer risk in pooled cohort studies, and no association between GI or GL and pancreatic cancer risk in combined cohort studies. [1]
  • The 2009 meta-analysis stated that there were insufficient data to draw conclusions for other digestive tract cancers. [1]
  • A 2008 meta-analysis reported that higher GI was associated with a modestly higher breast cancer risk in validated prospective studies. [2]
  • In a hospital-based case-control study of lung cancer, a higher glycemic index was associated with higher odds of lung cancer, glycemic load was not statistically significantly associated with lung cancer, and the carbohydrate quality index and low-carbohydrate diet score were associated with lower odds of lung cancer. [17]
  • In a large Korean cohort, no significant association was observed between carbohydrate intake and cancer mortality, and no clear associations were found between dietary glycemic index or glycemic load and all-cause, cancer, or cardiovascular mortality. [16]
  • In older adults at high cardiovascular risk, higher carbohydrate quality index was associated with lower cancer mortality, and participants in the lowest carbohydrate quality index quintile had higher risks of all-cause and cancer mortality than participants with higher scores. [15]
  • In the lung-cancer cohort, the hazard ratio for lung cancer was 1.13 for the highest versus lowest glycemic index quartile, 1.11 for non-small cell lung cancer, 1.34 for small cell lung cancer, 0.72 for lung cancer for the highest versus lowest glycemic load quartile, 0.68 for non-small cell lung cancer, and 0.90 for small cell lung cancer. [41]
  • The hepatocellular carcinoma review states that greater amounts of vegetables, legumes, fruits, and whole grain-derived products could provide low-glycemic index carbohydrates and alleviate the protumorigenic hepatic microenvironment. [40]
  • A 2024 meta-analysis summarized in a review reported that high glycemic index exposure was associated with higher diabetes-related cancer incidence, with a relative risk of 1.05 (95% CI 1.02 to 1.08) for high GI. [42]
  • The same 2024 meta-analysis summary reported that low glycemic index and low glycemic load diets were associated with lower breast cancer incidence in the cited literature. [42]
  • The same review reported that the positive association between glycemic index and breast cancer development was observed in post-menopausal women but not in pre-menopausal women in that meta-analysis. [43]
  • The 2024 review also reported that a meta-analysis of 12 cohort studies found only a weak association between high glycemic index or glycemic load and breast cancer risk. [43]
  • The same review reported that the glycemic index and glycemic load associations with breast cancer risk did not differ clearly by menopausal status in that meta-analysis. [43]
  • A 2024 review of breast-cancer diet misconceptions states that the evidence on sugar intake, glycemic index, and glycemic load remains limited and equivocal. [43]
  • In a prostate cancer xenograft model, a low-glycemic-index diet did not change overall survival, tumor volume, tumor weight, Ki67 staining, or histology compared with a high-glycemic-index diet. [10]
  • In the same prostate xenograft study, the low-glycemic-index diet was associated with lower body fat and lower liver weight, while body weight stayed similar. [10]
  • In the prostate xenograft study, the low-glycemic-index diet showed lower blood glucose, insulin, IGF-1, and IGF-1:IGFBP3 ratio and higher IGFBP3, but these differences were not statistically significant. [10]
  • In a pancreatic cancer case-control study, higher adherence to a cholesterol-lowering diet score that included low daily glycemic index was associated with lower pancreatic cancer risk. [11]
  • In a breast cancer cell study, glucose level changed proliferation, clonogenicity, invasion, apoptosis, and signaling in resistant cell lines, but the study did not test a low-glycemic diet in people. [45]
  • In the breast cancer cell study, hypoglycemia reduced colony formation in all control and resistant cells, and some resistant variants showed greater sensitivity to glucose deprivation. [45]
  • In the breast cancer cell study, hyperglycemia reduced overall cell death after paclitaxel in some resistant variants and was described as protecting chemo-resistant cells from paclitaxel action. [45]
  • The review on post-acute COVID-19 syndrome in cancer patients states that a balanced diet with low glycemic index and low inflammatory index is among the weight-management strategies discussed for vulnerable patients, and that a low-glycemic diet may contribute to reducing prolonged COVID-19 syndrome in obese patients, but this needs further research. [46]
  • In a prospective cohort of endometrial cancer survivors, higher prediagnosis dietary glycemic load was associated with higher second primary cancer risk. [47]
  • In the SUN cohort, a higher carbohydrate quality index, which included glycemic index as one component, was associated with lower incidence of obesity-related cancers. [48]
  • In a review of hormone-related cancers, several studies were reported to show positive associations between high glycemic index or glycemic load diets and breast cancer risk, but some studies reported no significant association. [14]
  • In the same review, studies of endometrial cancer were reported to show positive associations with high glycemic index or glycemic load in some populations, while other studies found null or opposite associations. [14]
  • In the same review, evidence for prostate cancer was described as limited and inconsistent, with some studies finding no significant association between refined carbohydrate intake and prostate cancer risk. [14]
  • In a pancreatic ductal adenocarcinoma review, glycemic disturbances and insulin resistance markers were more common in PDAC than in other pancreatic or periampullary tumors. [49]
  • In that review, TyG-high status was reported to be highest in early PDAC and lowest in late PDAC. [49]
  • The pancreatic ductal adenocarcinoma review reported that tumor stage and TyG status were independent risk factors for glycemic alterations, while age was not significant in the multivariable model for TyG-high status. [49]
  • In an Italian case-control study of ovarian cancer, higher adherence to a diabetes risk reduction diet, which included high dietary glycemic index as an unfavorable component, was associated with lower ovarian cancer odds. [63]
  • In the same ovarian cancer study, the one-point increment estimate for the diabetes risk reduction diet score was 0.98 in the overall sample and 0.97 after excluding women with diabetes, and the association did not differ across strata of age, education, parity, menopausal status, or family history of ovarian or breast cancer. [63]
  • A scoping review on endometrial cancer reported no association between glycemic index and endometrial cancer risk. [82]
  • The endometrial cancer scoping review also stated that plant-based, Mediterranean, or ketogenic diets were associated with lower endometrial cancer risk, but this was not a glycemic-index-specific finding. [82]
  • In a Chinese cohort analysis, higher dietary glycemic index and glycemic load were associated with higher cardiovascular mortality. [87]
  • In that cohort, women with higher dietary glycemic index had higher risks of all-cause mortality, cancer mortality, and cardiovascular mortality, while men showed a positive association between dietary glycemic load and cardiovascular mortality. [87]
  • In a case-control study of pancreatic cancer, higher adherence to a diabetes risk reduction diet that included low dietary glycemic index was associated with lower pancreatic cancer risk. [88]
  • In a case-control study of breast cancer, higher adherence to a diabetes risk reduction diet that included low dietary glycemic index was associated with lower breast cancer risk. [89]
  • A review of breast cancer survivorship reports that low-glycemic dietary patterns are discussed as part of broader healthy dietary patterns, but it also states that the evidence for the best dietary strategy after breast cancer diagnosis is still lacking. [66]
  • In one case-control study of endometrial cancer, higher adherence to a diabetes risk reduction diet that included lower glycemic load as one component was associated with lower endometrial cancer risk. [50]
  • In the same endometrial cancer study, the association was attenuated after additional adjustment for vegetable intake and was not detected among pre-menopausal women and current smokers. [50]
  • In a breast cancer prognosis review, higher glycemic load was reported to be associated with higher breast cancer-specific mortality and higher all-cause mortality in the Nurses' Health Study cohorts. [51]
  • The breast cancer prognosis review says randomized trial evidence would be needed to test whether a reduced glycemic load diet changes recurrence or death. [51]
  • For primary cancer prevention, a review of carbohydrate nutrition reported that observational findings for higher glycemic index or glycemic load were mixed across cancer types. [18]
  • For colorectal cancer, the same review reported several observational studies with positive associations between higher glycemic index or glycemic load and risk, including a meta-analysis that found a non-significant 5% increased risk with higher glycemic index foods. [18]
  • For prostate cancer, the carbohydrate review reported inconsistent findings, including studies with null associations and one study that found a reduced risk of advanced prostate cancer with higher fructose intake. [18]
  • For breast and other female reproductive cancers, the carbohydrate review reported inconsistent observational findings for glycemic index, glycemic load, and sugar intake. [18]
  • For pancreatic cancer, the PDAC review stated that the efficacy of gemcitabine increased in preclinical work when insulin-like growth factor signaling was inhibited, which the authors used to highlight the possible importance of dietary glycemic index in PDAC management. [19]
  • For non-cancer liver disease, a review stated that diets based on high glycemic index products intensify liver steatosis, particularly in people with insulin resistance. [20]
  • A review of resistant starch stated that resistant starch lowers postprandial blood glucose, serum cholesterol, and glycemic index, and it listed colon cancer among the conditions it may help prevent or improve. [67]
  • The consensus review states that diets low in glycemic index and glycemic load were relevant to the prevention and management of diabetes and coronary heart disease, and probably obesity. [21]
  • The cancer overview review reports moderate-to-weak associations between dietary glycemic index or glycemic load and selected cancers. [21][68]
  • The cancer overview review reports that high dietary glycemic load was directly associated with breast cancer risk in cohort studies. [68]
  • The breast-cancer prevention review states that high glycemic load is among dietary factors discussed as risk factors for breast cancer. [90]
  • The PCOS review states that low-glycemic-index foods are part of the dietary approach it describes for improving insulin resistance and metabolic and reproductive functions in women with polycystic ovary syndrome, a condition that the review says increases the risk of breast and endometrial cancer. [91]
  • A review on breast cancer reports that low-glycemic foods were associated with a lower incidence of diabetes and a lower breast cancer risk. [70]
  • The same review states that a healthy dietary pattern including high fiber, high n-3/n-6 ratio, high polyphenols, and low-glycemic foods was associated with lower breast cancer risk and better survival for women with early-stage breast cancer. [70]
  • The Mediterranean dietary pattern is described as including low glycemic index and high dietary fiber, and as reducing the risk of certain pathologies such as cancer. [73]
  • The Italian Mediterranean-diet pyramid review states that a traditional Mediterranean diet with sourdough wholemeal bread can be qualified as a low-GI diet and that low-GI/GL diets have been associated with cancer-related outcomes in observational and review-level discussion. [71]
  • In a prostate cancer review, small clinical trials suggested that a low-glycemic index diet could alter tumor biology as measured by tumor gene expression changes. [75]
  • The same prostate cancer review stated that a common mechanism for the observed tumor gene expression changes may be weight loss. [75]
  • The prostate cancer review also reported that larger and longer-term studies were needed to determine the clinical relevance of these findings. [75]
  • A breast cancer review reported that diets high in carbohydrates and glycemic load were associated with increased risk of breast cancer in Mexican women, particularly postmenopausal breast cancer. [92]
  • A review of whole grain intake stated that higher whole grain consumption was associated with lower body mass index and lower body weight gain in prospective epidemiological studies, and it noted that whole grains are associated with a lower risk of cancer. [76]
  • A review of diet and inflammation reported that significant dietary influences have been established for glycemic index and glycemic load. [74]
  • Some case-control and cohort studies found positive associations between dietary glycemic index and the risk of colon, breast, and prostate cancers. [22]
  • In a review of breast cancer studies, glycemic index was among the newer dietary factors studied, but only alcohol intake, being overweight, and weight gain were reported as having consistent and strong positive associations with breast cancer risk. [55]
  • In a series of Italian case-control studies, refined grains and the related glycemic load and index were associated with increased risks of several cancers. [56]
  • The sources also state that low-glycemic diets have been reported to improve serum lipid profile, reduce C-reactive protein concentrations, and aid in weight control, but these findings are not cancer-specific. [22]
  • The evidence base is described as inconsistent, and one review says the strength of evidence for low-GI health effects is uncertain because glycemic index methodology is not well standardized. [22][23]
Practical considerationsLow-glycemic diets are generally described in terms of glycemic index and glycemic load, with practical use limited by variation across foods and by the lack of GI and GL values on labels. In cancer-related sources, no standardized low-glycemic diet protocol is provided, although some reviews discuss broader dietary patterns that emphasize higher fiber, whole grains, fruits, vegetables, and legumes.40 points
  • Glycemic index (GI) is an index of how quickly carbohydrate foods raise blood glucose, and glycemic load (GL) is GI multiplied by available carbohydrate content in a given amount of food. [4]
  • Validated food-frequency questionnaires were used in all studies in the 2019 meta-analysis, and most studies used glucose as the reference food for GI and GL calculation. [4]
  • Low-glycemic foods are defined as foods with a glycemic index value of 55 or lower. [93][71]
  • Dietary glycemic index can be calculated from food-frequency questionnaire data by weighting each food's glycemic index by available carbohydrate and dividing by total available carbohydrate. [94]
  • Predicted glycaemic index testing can be performed after simulated gastric and duodenal digestion. [60]
  • Low-glycemic index carbohydrates are described as coming from vegetables, legumes, fruits, and whole grain-derived products. [40]
  • Whole grains and legumes are described as sources of fiber, resistant starch, and protein, whereas refined products are described as sources of rapidly digestible starch. [61]
  • Integration of whole grains and legumes with restriction of refined starches has been associated with favorable health outcomes. [61]
  • Glycemic index and glycemic load values can vary by food source, variety, and preparation method. [42]
  • The lack of GI and GL values on food labels makes these concepts difficult for consumers to apply in practice. [42]
  • Focusing on overall food quality, such as higher fiber and whole-grain intake, may be more practical than relying on GI or GL values alone. [42]
  • A low-glycemic-index Western diet and a high-glycemic-index Western diet can differ mainly by carbohydrate source rather than total carbohydrate amount. [10]
  • In one pancreatic cancer case-control study, low glycemic index was defined using sex-specific cutoffs of less than 71.0 for women and less than 70.9 for men. [11]
  • Enzymatic preparation with alpha-amylase and pullulanase is a common method for making RS3. [12]
  • The Nordic Nutrition Recommendations 2012 did not include glycemic index or glycemic load as recommendations because there was not enough evidence at that time. [13]
  • In NNR 2012, the recommended interval for total carbohydrates was 45-60% of energy, and whole grain cereals, whole fruit, berries, vegetables, and pulses were the major carbohydrate sources. [13]
  • A carbohydrate quality index can give positive weight to dietary fiber, the ratio of whole grains to total grain carbohydrates, and the ratio of solid to total carbohydrates, and negative weight to glycemic index. [48]
  • Dietary plans using glycemic index and glycemic load estimates can be created from available lists of serving sizes, carbohydrate content, GI and GL values. [14]
  • Dietary measures for dumping syndrome include smaller meals, six meals per day, restriction of carbohydrate load, and low glycemic index carbohydrates. [64]
  • When carbohydrate intake is reduced, high-fiber and protein-rich foods can be used as substitute calorie sources. [64]
  • Gum guar, pectin, and glucomannan can be added to meals, but gas formation and bloating are common intolerable side effects. [64]
  • The low-glycemic concept is described using dietary glycemic index and glycemic load rather than a single food. [87][88][89]
  • Millet GI values vary by type, with a range from 33 to 65, and millet dietary fiber content is higher than that of rice, wheat, and maize. [65]
  • Dietary changes after breast cancer diagnosis are influenced by sociodemographic, psychosocial, and clinical factors such as education, income, optimism, social support, physical well-being, and neuropathy symptoms. [66]
  • For most breast cancer survivors, dietary guidelines emphasizing vegetables, fruits, whole grains, and legumes and reduced sugar, calorie-dense foods, and sugary drinks were considered reasonable for general health. [51]
  • In a NAFLD review, attention was directed to glycemic index and energy value of foods, and favorable effects were observed with a Mediterranean diet and a healthy-food-pyramid diet including low- and medium-glycemic-index products. [20]
  • Resistant starch has potential applied value in food products such as bread, noodles, and dumplings. [67]
  • GI is described as a valid and reproducible method of classifying carbohydrate foods for postprandial glycemia. [21]
  • Information on GI and GL should be communicated through national dietary guidelines, food composition tables, and food labels. [21]
  • A dietary approach for PCOS includes limiting simple sugars and refined carbohydrates, eating foods with a low glycemic index, reducing saturated and trans fatty acids, and addressing possible deficiencies such as vitamin D, chromium, and omega-3. [91]
  • Many diet regimens exist, and no one diet has been universally successful at inducing and maintaining weight loss. [95]
  • A Mediterranean-diet pattern is built around vegetables, fruits, cereals preferably as whole grain, legumes, nuts, fish, shellfish, white meat, eggs, dairy products, olive oil, water, and moderate wine, with smaller amounts of red meat, processed meats, sugars, and fats. [73]
  • Fruits, vegetables, beans, pasta, dairy foods, and nuts can have a low glycemic index, and sourdough wheat bread is classified as a low-GI food using a GI cutoff of 55 or less. [71]
  • Half a cup of beans or peas per day can increase intakes of protein, fiber, iron, zinc, folate, and magnesium. [72]
  • An applicable diet with low glycemic index and appropriate calorie intake is preferred in childhood fatty liver, but it is not presented as a proven treatment. [96]
  • The low glycemic index treatment for epilepsy was described as providing carbohydrates with glycemic indices below 50 to maintain stable blood glucose levels. [97]
  • The low glycemic index treatment for epilepsy is started as an outpatient without a fast. [97]
  • Nearly one quarter of children still found the low glycemic index treatment restrictive and stopped for that reason. [97]
  • Sources describe low-glycemic or low-glycemic-load dietary patterns as including nutrient-dense, high-fiber foods, with vegetables, fruit, and whole grains emphasized and refined grains reduced. [77][56][98]
  • As a general rule for older adults with type 2 diabetes, nutrient-dense, low-glycemic-index, high-dietary-fiber foods are recommended. [98]
Safety & interactionsThe sources generally do not report specific safety concerns, adverse effects, or treatment interactions for low-glycemic diets in cancer settings. A few related reviews discuss broader ketogenic or dietary-therapy safety issues, but cancer-specific data remain limited.17 points
  • A malignant glioma review says ketogenic metabolic therapy, including low-glycemic diets, has some safety and feasibility data, but the evidence is still limited. [99]
  • That same review says ongoing clinical trials are examining safety, metabolic impact, patient compliance, clinical or survival benefit, compatibility with other anti-cancer treatments, ethical aspects, and quality of life. [99]
  • The starch and polyphenol review notes that higher doses of polyphenols may have deleterious effects and that safety data are limited. [61]
  • The planetary-diet critique states that plant-based diets can create dependence on synthetic supplements and may risk deficiencies in vitamin B12, heme iron, zinc, iodine, selenium, taurine, and DHA. [100]
  • The same critique says these deficiencies are well documented even among informed vegetarians and vegans and may be important for vulnerable groups such as children, pregnant women, the elderly, and the chronically ill. [100]
  • The breast cancer cell study found that higher glucose conditions reduced the overall cell-death response to paclitaxel in some resistant cell lines. [45]
  • The post-acute COVID-19 review notes that chemotherapy or immunotherapy can further weaken immune response and increase susceptibility to prolonged COVID-19 symptoms in cancer patients. [46]
  • The white clover muffin study reported no cytotoxic effect of the tested extracts on melanoma cells or normal fibroblasts. [62]
  • The same study reported that extracts from white clover flowers and muffins with 7.5% white clover addition inhibited melanoma cell proliferation by almost 50%, while extracts from control muffins and muffins with 2.5% addition did not show that pattern. [62]
  • The same study reported high proliferation of normal BJ fibroblasts after exposure to the extracts, which the authors interpreted as suggesting safety for normal cells. [62]
  • The dumping syndrome review reports that acarbose may cause flatulence and bloating. [64]
  • The dumping syndrome review reports that somatostatin analogs such as octreotide may cause injection-site pain, gallstone formation, nausea, and mild steatorrhea. [64]
  • The millets review states that millets are gluten-free cereal grains and can be consumed regularly by celiac patients. [65]
  • The PDAC review stated that gemcitabine is the chemotherapy backbone discussed alongside dietary measures in that article. [19]
  • The NAFLD review stated that very low-calorie diets are not recommended in NAFLD because, despite reducing hepatic steatosis, they were associated with worsening fibrosis and necrosis from excessive weight loss. [20]
  • The epilepsy review stated that the low glycemic index treatment was developed as a less restrictive alternative within ketogenic dietary therapies and may reduce the burden of dietary restrictiveness. [97]
  • The epilepsy review stated that dietary therapies can cause adverse effects, including hypercholesterolemia, mineral deficiencies, acidosis, constipation, and weight loss. [97]

Sources

Every statement above is drawn from these reviewed sources. This page reports what they describe. Sources last checked June 9, 2026.

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