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Carbs: how much you need, and what cutting them really does

Cutting carbohydrate is sold as the shortcut to weight loss, yet in adults with overweight or obesity, with calories matched, a ketogenic diet beat a higher carbohydrate diet by 3.3 lb (1.49 kg), on evidence its authors rated low certainty. What ketogenic diets move reliably is blood fat in both directions. Two 2026 meta-analyses of 53 and 62 trials found triglycerides down by about 20 mg/dL and LDL cholesterol up by about 8 mg/dL.

Every statement on this page is tied to a source. The badge shows what kind of evidence stands behind it. Evidence A is a meta-analysis or systematic review. E is the position of an expert body without its own analysis. Click "source" for the exact sentence we took it from. How we verify →

What kind of evidence stands behind this page
Level A — Meta-analysis or systematic review: 33 of 70 statementsLevel B — Randomized controlled trial(s): 9 of 70 statementsLevel C — Observational data: 5 of 70 statementsLevel D — Mechanistic or laboratory data: 3 of 70 statementsLevel E — Position of an expert body: 20 of 70 statements

A · 33B · 9C · 5D · 3E · 20

70 statements. A meta-analysis · B randomized trial · C observational · D laboratory · E position of an expert body. A page leaning on E is reporting consensus rather than weighing trials, and you can see that before you read a word of it.

We read the trials on this one. Do carbs cause inflammation? → Every estimate on one scale, with the search protocol shown.

We read the trials on this one. Does a low-carb diet improve blood sugar and insulin resistance? → Every estimate on one scale, with the search protocol shown.

We read the trials on this one. Does a low-carb diet affect cholesterol and triglycerides? → Every estimate on one scale, with the search protocol shown.

We read the trials on this one. Does a low-carb diet cause constipation? → Every estimate on one scale, with the search protocol shown.

What it does in the body

How much you need

How well your body absorbs it

Who is most likely to fall short

What the evidence does and does not show

What too much does

Medicines it interacts with

How much you need, and where the ceiling is
0RDA (adults) 130 gNo upper limit set

No Tolerable Upper Intake Level has been set for this nutrient, which is not the same as unlimited. Values from cards cb-d-08 below.

What to do with this

The American RDA is 130 g a day, rising to 175 g in pregnancy and 210 g while breastfeeding. That reference value dates from 2005 and is being rebuilt now.

Source matters more to the World Health Organization than amount. It recommends carbohydrate mainly from whole grains, vegetables, fruit and pulses, with at least 14 oz (400 g) of vegetables and fruit and 25 g of fiber a day for adults. In adults at high risk of type 2 diabetes, replacing 100 g a day of refined staples with whole grain improved triglycerides and the triglyceride-glucose index. The US label ceiling for added sugars is 50 g a day from age 4 and 25 g for children aged 1 to 3.

Read the label with one caution. Total carbohydrate is calculated by difference and includes starch, sugars, sugar alcohols and fiber together. Net carbs is not a regulated term, and manufacturers have defined it in conflicting ways.

If you take insulin or other glucose-lowering drugs, the American Diabetes Association says a very low carbohydrate plan needs medical oversight, because doses may need lowering to prevent hypoglycemia. On an SGLT2 inhibitor it advises avoiding very low carbohydrate eating because of ketoacidosis. It does not recommend very low carbohydrate eating in pregnancy or breastfeeding, for children, with kidney disease or with disordered eating. Lean adults saw the largest LDL rise on ketogenic diets, 42 mg/dL (1.08 mmol/L) in 3 trials of normal-weight adults.

Where to get it from food

Best sources of Carbohydrate on this site, per portion
Frostings, white, fluffy, dry…Frostings, white, fluffy, dry mix: 71% DV71%TriticaleTriticale: 50% DV50%Sorghum grainSorghum grain: 50% DV50%Rye grainRye grain: 47% DV47%Cranberry-orange relish, cann…Cranberry-orange relish, canned: 46% DV46%Barley malt flourBarley malt flour: 46% DV46%Cornmeal, degermed, whiteCornmeal, degermed, white: 45% DV45%Cornmeal, degermed, yellowCornmeal, degermed, yellow: 45% DV45%

Share of the Daily Value (275 g) in one typical portion.

FoodPortion% DV
Frostings, white, fluffy, dry mix1 package (207 g)71%
Triticale1 cup (192 g)50%
Sorghum grain1 cup (192 g)50%
Rye grain1 cup (169 g)47%
Cranberry-orange relish, canned1 cup (275 g)46%
Barley malt flour1 cup (162 g)46%
Cornmeal, degermed, white1 cup (157 g)45%
Cornmeal, degermed, yellow1 cup (157 g)45%

Top sources among the 1252 USDA entries on this site, per typical portion. Full ranking →

The bottom line

The reference number for carbohydrate is less solid than it looks. The 130 g RDA rests on the brain's estimated glucose need, and the agency review behind the next American values says future figures should aim at chronic disease risk instead. The World Health Organization declined to set an amount at all. What it does cite is a wide band, with intakes of about 40 to 70 percent of energy going with lower death rates than intakes outside it, an observational pattern. The glycemic index is the open argument. WHO set it aside after trials showed little to no change in cardiometabolic risk factors. A year later a meta-analysis of ten cohorts linked high glycemic index diets with more type 2 diabetes (RR 1.27, 95% CI 1.21 to 1.34), an association that cannot show cause. In type 2 diabetes, low carbohydrate helps early and then fades. A 2021 meta-analysis found HbA1c 0.47 points lower than on control diets at six months and 0.23 points lower at twelve, where the confidence interval reached zero. Six trials lasting over a year found no significant difference. Diets higher in both fiber and carbohydrate lowered HbA1c by 0.50 points against lower carbohydrate, lower fiber diets in 10 trials of 499 people with diabetes. Inflammation is a weak reason to cut carbohydrate. Low carbohydrate did not lower CRP, IL-6 or TNF-alpha more than low-fat diets in 25 trials of 2,222 adults. Against higher carbohydrate diets in general, CRP fell by 0.37 mg/L across 174 trials, and in another analysis of 60 trials the CRP fall lost significance once a single trial was removed. The LDL rise depends on who is dieting. In trials of lean adults eating under 4.6 oz (130 g) a day, LDL rose by 41 mg/dL, while at a BMI of 35 or more it fell slightly. One lean 51-year-old woman with an ABCG5 gene variant went from 142 to 555 mg/dL, a single case report. Constipation was the most reported adverse event in prospective ketogenic studies, 24 percent of 743 recorded events. Weight-loss trials in adults without diabetes found no clear difference in constipation at three to six months, on very low certainty evidence. Cooking shifts the glucose response too. In healthy volunteers in Sweden, boiled potatoes chilled for 24 hours and eaten with vinaigrette had a glycemic index of 96 against 168 for freshly boiled ones, a result that combines cooling with vinegar.

Daily Values are one number for everyone. Yours depend on your body, activity and goal. Bioma works out your personal targets and shows every meal against them, from a photo. About Bioma →

Deep reviews on this topic

Foods discussed in this guide

Sources

  1. cb-d-08 · Position of an expert body · agency systematic review, background
    For children older than 1 year and adults of all age groups and sexes, the Recommended Dietary Allowance (RDA) of carbohydrates is set as 130 grams per day.
    AHRQ, Association of Digestible Carbohydrate Intake With Cardiovascular Disease, Type 2 Diabetes, 2025 · checked 2026-09-21 · independently re-checked
  2. cb-d-16 · Position of an expert body · regulatory register entry
    POL-HC-8438 Carbohydrates Carbohydrates contribute to the maintenance of normal brain function Authorised (value from the source's table, not a sentence)
    EU Register on nutrition and health claims (European Commission) · checked 2026-09-21 · independently re-checked
  3. cb-d-06 · Position of an expert body · regulatory text
    This calculation method is called ``carbohydrate by difference'' and is described in A.L. Merrill and B.K. Watt, ``Energy Value of Foods--Basis and Derivation,'' in the USDA Handbook No. 74 (Ref. 63).
    FDA, Food Labeling: Revision of the Nutrition and Supplement Facts Labels, proposed rule, 2014 · checked 2026-09-21 · independently re-checked
  4. cb-d-01 · Position of an expert body · WHO guideline
    Consequently, this guideline does not include recommendations on the amount of carbohydrate that should be consumed, and carbohydrate intake should continue to be based on recommended levels of protein (32) and fat intake (101).
    Carbohydrate intake for adults and children: WHO guideline, 2023 · checked 2026-09-21 · independently re-checked
  5. cb-d-02 · Position of an expert body · WHO guideline remark citing a meta-analysis
    Intakes of approximately 40–70% of total energy intake as carbohydrate are associated with reduced risk of mortality compared with lower (<40%) or higher (>70%) intakes.
    Carbohydrate intake for adults and children: WHO guideline, 2023 · checked 2026-09-21 · independently re-checked
  6. cb-d-03 · Position of an expert body · WHO guideline
    In adults, WHO recommends an intake of at least 25 g per day of naturally occurring dietary fibre as consumed in foods (strong recommendation).
    Carbohydrate intake for adults and children: WHO guideline summary, 2023 · checked 2026-09-21 · independently re-checked
  7. cb-d-19 · Position of an expert body · reference dataset
    Added Sugars [DRV, Grams (g)] 21 CFR 101.9(c)(9) · 50 Adults and children ≥4 years · N/A Infants through 12 months · 25 Children 1 through 3 years · 50 Pregnant women and lactating women (value from the source's table, not a sentence)
    21 CFR 101.9(c)(9), Daily Reference Values, FDA · checked 2026-09-21 · independently re-checked
  8. cb-d-17 · Position of an expert body · agency systematic review, statement of purpose
    These two reviews intend to inform the upcoming U.S. and Canadian government DRI guideline about dietary digestible carbohydrate intake.
    AHRQ, Association of Digestible Carbohydrate Intake With Cardiovascular Disease, Type 2 Diabetes, 2025 · checked 2026-09-21 · independently re-checked
  9. cb-d-07 · Position of an expert body · regulatory text
    The petition suggested that the varied approaches to describing carbohydrates have led to consumer confusion.
    FDA, Food Labeling: Revision of the Nutrition and Supplement Facts Labels, proposed rule, 2014 · checked 2026-09-21 · independently re-checked
  10. cb-d-14 · Position of an expert body · reference dataset
    Pudding, rice, Carbohydrate, by difference 18.39 G per 100 g [fdc_id 2705685] · 1 cup 260 g 47.8 G · Rice milk, Carbohydrate, by difference 9.17 G per 100 g [fdc_id 2705411] · 1 cup 244 g 22.4 G (value from the source's table, not a sentence)
    USDA FNDDS 2021-2023 (Food and Nutrient Database for Dietary Studies) · checked 2026-09-21 · independently re-checked
  11. cb-d-20 · Randomized controlled trial(s) · controlled crossover meal trial
    Cold storage of boiled potatoes increased resistant starch (RS) content significantly from 3.3 to 5.2% (starch basis).
    European Journal of Clinical Nutrition, 2005 · checked 2026-09-21 · independently re-checked
  12. cb-d-13 · Position of an expert body · source coverage check
    «carbohydrate» is NOT in the USDA retention table. Release 6 has exactly 26 nutrients, and this is not among them, neither among the 16 parsed nor among the 10 skipped with a reason. (value from the source's table, not a sentence)
    USDA Table of Nutrient Retention Factors, Release 6 (2007), Agricultural Research Service · checked 2026-09-21 · independently re-checked
  13. ev-lcbs-11 · Position of an expert body · guideline
    In addition, very-low-carbohydrate eating plans are not currently recommended for individuals who are pregnant or lactating, children, people who have kidney disease, or people with or at risk for disordered eating (46).
    American Diabetes Association Professional Practice Committee, 5. Facilitating Positive Health Behaviors and Well-being to Improve Health Outcomes: Standards of Care in Diabetes-2026, Diabetes Care 2026;49(Suppl 1):S89-S131 · checked 2026-10-07 · independently re-checked
  14. ev-lcch-05 · Meta-analysis or systematic review · meta-analysis of RCTs
    For trials with mean baseline BMI <25, LDL cholesterol increased by 41 mg/dL (95% CI: 19.6, 63.3) on the LCD.
    Am J Clin Nutr, 2024 · checked 2026-10-07 · independently re-checked
  15. ev-lcch-06 · Meta-analysis or systematic review · meta-analysis of RCTs
    A KD significantly increased TC by 1.47 mmol/L (95%CI, 0.72-2.22 mmol/L), LDL-C by 1.08 mmol/L (95%CI, 0.37-1.79 mmol/L), and apoB by 0.35 g/L (95%CI, 0.06-0.65 g/L).
    Nutr Rev, 2023 · checked 2026-10-07 · independently re-checked
  16. ev-lcbs-08 · Randomized controlled trial(s) · randomized controlled trial
    The delta HbA1c improved in both groups: -0.7% vs. -0.1% (p = 0.02).
    Acta Paediatr, 2025 · checked 2026-10-07 · independently re-checked
  17. ev-lccon-03 · Meta-analysis or systematic review · meta-analysis
    Adverse events varied: constipation was most common with MAD (30.97%), whereas KD had higher rates of respiratory infections (42.77%, P < 0.0001 vs. MAD) and diarrhea (13.75% vs. 8.11%, P = 0.0017).
    World J Pediatr, 2025 · checked 2026-10-07 · independently re-checked
  18. ev-lccon-04 · Meta-analysis or systematic review · meta-analysis
    The most commonly reported adverse effects were vomiting, constipation and diarrhoea for both the intervention and usual care group, but the true effect could be substantially different (low-certainty evidence).
    Cochrane Database Syst Rev, 2020 · checked 2026-10-07 · independently re-checked
  19. cb-d-09 · Meta-analysis or systematic review · meta-analysis of randomized controlled trials
    Ketogenic diets were associated with slightly greater weight loss than higher-carbohydrate diets (MD = -1.49 kg; 95% CI: -2.41 to -0.58; p = 0.008; I2 = 0%).
    Nutrients, 2026 · checked 2026-09-21 · independently re-checked
  20. cb-d-10 · Meta-analysis or systematic review · meta-analysis of randomized controlled trials
    Under energy-matched conditions, LC confers modest advantages for glycaemia, HDL-C, and TAG, whereas HC better lowers LDL-C.
    European Journal of Nutrition, 2026 · checked 2026-09-21 · independently re-checked
  21. cb-d-04 · Position of an expert body · WHO guideline
    glycaemic index and glycaemic load only provide information about how a food affects postprandial glucose levels; they do not take into consideration other potentially undesirable components of the food that may contribute to a reduction in diet quality.
    Carbohydrate intake for adults and children: WHO guideline, 2023 · checked 2026-09-21 · independently re-checked
  22. cb-d-05 · Observational data · meta-analysis of prospective cohorts
    Consumption of high GI foods was associated with an increased incidence of type 2 diabetes (RR 1·27 [95% CI 1·21-1·34]; p<0·0001), total cardiovascular disease (1·15 [1·11-1·19]; p<0·0001), diabetes-related cancer (1·05 [1·02-1·08]; p=0·0010), and all-cause mortality (1·08 [1·05-1·12]; p<0·0001).
    Lancet Diabetes & Endocrinology, 2024 · checked 2026-09-21 · independently re-checked
  23. cb-d-12 · Randomized controlled trial(s) · randomized controlled trial, secondary exploratory analysis
    Standardized whole-grain staple replacement
    Nutrients, 2026 · checked 2026-09-21 · independently re-checked
  24. ev-lcch-04 · Meta-analysis or systematic review · Cochrane review
    There is probably little to no difference in weight reduction and changes in cardiovascular risk factors up to two years' follow-up, when overweight and obese participants without and with T2DM are randomised to either low-carbohydrate or balanced-carbohydrate weight-reducing diets.
    Cochrane Database Syst Rev, 2022 · checked 2026-10-07 · independently re-checked
  25. ev-lcch-07 · Meta-analysis or systematic review · network meta-analysis
    Ketogenic diets showed the largest increases in LDL cholesterol [0.43 mmol/L (0.13; 0.74)] total cholesterol [0.55 mmol/L (0.13; 0.96)] and HDL cholesterol [0.12 mmol/L (0.06; 0.18)], compared with the reference diet, whereas triglyceride responses differed, with high-carbohydrate diets increasing them [0.24 mmol/L (0.04; 0.43)].
    Eur J Nutr, 2026 · checked 2026-10-07 · independently re-checked
  26. ev-lcch-08 · Meta-analysis or systematic review · meta-analysis of RCTs
    As with glycemic control, there were no significant differences in the changes in weight loss, blood pressure, and low-density lipoprotein cholesterol between long-term LCD and control diets.
    J Diabetes Investig, 2024 · checked 2026-10-07 · independently re-checked
  27. ev-lcch-09 · Randomized controlled trial(s) · RCT
    At 12 months, participants on the low-carbohydrate diet had greater decreases in weight (mean difference in change, -3.5 kg [95% CI, -5.6 to -1.4 kg]; P = 0.002), fat mass (mean difference in change, -1.5% [CI, -2.6% to -0.4%]; P = 0.011), ratio of total-high-density lipoprotein (HDL) cholesterol (mean difference in change, -0.44 [CI, -0.71 to -0.16]; P = 0.002), and triglyceride level (mean difference in change, -0.16 mmol/L [-14.1 mg/dL] [CI, -0.31 to -0.01 mmol/L {-27.4 to -0.8 mg/dL}]; P = 0.038) and greater increases in HDL cholesterol level (mean difference in change, 0.18 mmol/L [7.0 mg/dL] [CI, 0.08 to 0.28 mmol/L {3.0 to 11.0 mg/dL}]; P < 0.001) than those on the low-fat diet.
    Ann Intern Med, 2014 · checked 2026-10-07 · independently re-checked
  28. ev-lcch-10 · Randomized controlled trial(s) · RCT
    The relative reduction in the ratio of total cholesterol to high-density lipoprotein cholesterol was 20% in the low-carbohydrate group and 12% in the low-fat group (P=0.01).
    N Engl J Med, 2008 · checked 2026-10-07 · independently re-checked
  29. ev-lcbs-01 · Meta-analysis or systematic review · meta-analysis
    LCDs achieved greater reductions in HbA1c than did control diets (mean difference –0.47%, –0.60 to –0.34; n=747; GRADE=high) (table 2). At 12 months, eight studies reported on HbA1c levels, showing that the effect size had decreased by around half (mean difference –0.23%, –0.46% to 0.00%; n=489; GRADE=moderate) (table 2).
    BMJ, 2021 · checked 2026-10-07 · independently re-checked
  30. ev-lcbs-02 · Meta-analysis or systematic review · meta-analysis
    At six months, compared with control diets, LCDs achieved higher rates of diabetes remission (defined as HbA1c <6.5%) (76/133 (57%) v 41/131 (31%); risk difference 0.32, 95% confidence interval 0.17 to 0.47; 8 studies, n=264, I2=58%). Conversely, smaller, non-significant effect sizes occurred when a remission definition of HbA1c <6.5% without medication was used.
    BMJ, 2021 · checked 2026-10-07 · independently re-checked
  31. ev-lcbs-03 · Meta-analysis or systematic review · meta-analysis
    LCDs improved glycemia short-term: HbA1c - 0.29 %, with the largest effect at 3 months. Fasting blood glucose decreased overall (-7.12 mg/dL).
    Diabetes Res Clin Pract, 2025 · checked 2026-10-07 · independently re-checked
  32. ev-lcbs-04 · Meta-analysis or systematic review · meta-analysis
    This study did not show significant differences in changes in glycated hemoglobin between long-term LCD and control diets (standardized mean difference -0.11, 95% confidence interval -0.33 to 0.11, P = 0.32).
    J Diabetes Investig, 2024 · checked 2026-10-07 · independently re-checked
  33. ev-lcbs-05 · Meta-analysis or systematic review · network meta-analysis
    A very low-carbohydrate, high-protein, and calorie-restricted diet had the greatest effect on reducing HbA1c (range of mean difference: - 1.0% to - 1.79%), weight (range of mean difference: -5.83 kg to -10.96 kg), and FPG (range of mean difference: - 2.20 mmol/L to - 2.88 mmol/L) at 6-month follow-up, but at 12-month follow-up, the effect remained only for HbA1c (range of mean difference: - 1.25% to - 1.30%) and FPG (range of mean difference: - 1.21 mmol/L to - 1.27 mmol/L).
    J Health Popul Nutr, 2025 · checked 2026-10-07 · independently re-checked
  34. ev-lcbs-06 · Meta-analysis or systematic review · meta-analysis
    CRDs significantly improved glycemic control (including glucose: SMD = -2.94 mg/dL, 95 % CI: -4.19, -1.68; insulin: SMD = -8.19 pmol/L, 95 % CI: -11.04, -5.43; HOMA-IR = -0.54, 95 % CI: -0.75, -0.33), hepatic stress (GGT: SMD = -6.08 U/L, 95 % CI: -9.97, -2.20), renal function (UACR: SMD = -0.19, 95 % CI: -0.28, -0.10), and adipokine concentration (leptin: SMD = -3.25 ng/mL, 95 % CI: -4.91, -1.59), particularly in females, individuals with overweight/obesity, and people with T2DM.
    Clin Nutr, 2025 · checked 2026-10-07 · independently re-checked
  35. ev-lcbs-07 · Meta-analysis or systematic review · meta-analysis
    Pooled findings indicate that higher fiber higher carbohydrate diets reduced HbA1c (mean difference [MD] -0.50% [95% confidence interval -0.99 to -0.02]), fasting insulin (MD -0.99 μIU/mL [-1.83 to -0.15]), total cholesterol (MD -0.16 mmol/L [-0.27 to -0.05]) and low-density lipoprotein cholesterol (MD -0.16 mmol/L (-0.31 to -0.01) when compared with lower carbohydrate lower fiber diets.
    Obes Rev, 2025 · checked 2026-10-07 · independently re-checked
  36. ev-lcbs-09 · Position of an expert body · guideline
    5.15 Consider reducing carbohydrate intake for some adults with diabetes to improve glycemia. An effective way to achieve this is by limiting consumption of processed foods.
    American Diabetes Association Professional Practice Committee, 5. Facilitating Positive Health Behaviors and Well-being to Improve Health Outcomes: Standards of Care in Diabetes-2026, Diabetes Care 2026;49(Suppl 1):S89-S131 · checked 2026-10-07 · independently re-checked
  37. ev-crbi-01 · Meta-analysis or systematic review · meta-analysis
    No significant differences were found between LC and LF diets for interleukin-6 (SMD: -0.01; 95% CI: -0.12 to 0.09), C-reactive protein (SMD: -0.01; 95% CI: -0.11 to 0.09), or tumor necrosis factor-alpha (SMD: -0.03; 95% CI: -0.18 to 0.11), nor for adiponectin, leptin, or resistin.
    Nutr Res, 2026 · checked 2026-10-07 · independently re-checked
  38. ev-crbi-02 · Meta-analysis or systematic review · meta-analysis
    Sensitivity analysis by omitting each study one at a time showed the meta‐analysis result was influenced by Abbaspour Rad et al. (Rad et al. 2023) study, which changed the significance of the results (MD = −0.14; 95% CI: −0.28 to 0.00; p = 0.052) while the heterogeneity remained unchanged (Cochrane's Q‐test, p = 0.002, I 2 = 37.2%).
    Food Science & Nutrition, 2025, Effect of Low-Carbohydrate Diets on C-Reactive Protein Level in Adults: A Systematic Review and Meta-Analysis of Randomized Controlled Trials · checked 2026-10-07 · independently re-checked
  39. ev-crbi-03 · Meta-analysis or systematic review · meta-analysis
    For cardiovascular health, compared with higher-carbohydrate diets, CRDs significantly reduced blood pressure: SBP (–2.05 mmHg) and DBP (–1.26 mmHg); lipid profiles: TG (–15.11 mg/dL), LDL–HDL ratio (–0.18), TG-HDL ratio (–0.32), VLDL (–3.34 mg/dL), and ApoB-ApoA1 ratio (–0.03); and other endothelial and inflammatory markers: E-selectin (–2.23 ng/mL), CRP (–0.37 mg/L), and TNF-α (–0.27 pg/mL).
    Am J Clin Nutr, 2025 · checked 2026-10-07 · independently re-checked
  40. ev-crbi-05 · Meta-analysis or systematic review · meta-analysis
    The pooled findings showed that a KD has an effect on lowering TNF-α (WMD: -0.32 pg/mL; 95% CI: -0.55, -0.09; P = 0.007) and IL-6 (WMD: -0.27 pg/mL; 95% CI: -0.52, -0.02; P = 0.036) compared with control groups.
    Nutr Rev, 2025 · checked 2026-10-07 · independently re-checked
  41. ev-crbi-06 · Meta-analysis or systematic review · meta-analysis
    Weighted mean differences in change of C-reactive protein [WMD: -0.43 mg/dl, (95% CI -0.78 to -0.09), p = 0.01], and fasting insulin [WMD: -5.16 pmol/L, (95% CI -8.45 to -1.88), p = 0.002] were significantly more pronounced in benefit of low GI/GL diets.
    Nutr Metab Cardiovasc Dis, 2013 · checked 2026-10-07 · independently re-checked
  42. ev-crbi-07 · Meta-analysis or systematic review · meta-analysis
    trivial reductions in fasting blood glucose (−0.36 mmol/L (−0.42 to −0.19), P<0.001; substantial heterogeneity; I2=54%, P<0.001) and CRP (−0.41 mg/L (−0.78 to −0.04), P=0.03; no substantial heterogeneity, I2=24%, P=0.26).
    BMJ, 2021 · checked 2026-10-07 · independently re-checked
  43. ev-crbi-08 · Meta-analysis or systematic review · meta-analysis
    The results of the meta-analysis did not show significant differences (p > 0.05) between low GI and higher GI diets with respect to adiponectin and C-reactive proteins in patients with type 2 diabetes, but a significant difference (p < 0.001) was observed between the two groups in relation to interleukin-6.
    Nutrients, 2019 · checked 2026-10-07 · independently re-checked
  44. ev-crbi-09 · Meta-analysis or systematic review · meta-analysis
    Meta-analysis including 14 RCTs showed that intervention with dietary fiber or fiber-rich food, compared with control, produced a slight, but significant reduction of 0.37 mg/L (95% CI -0.74, 0) in circulating CRP level among this population.
    Int J Food Sci Nutr, 2015 · checked 2026-10-07 · independently re-checked
  45. ev-crbi-10 · Meta-analysis or systematic review · meta-analysis
    The evidence provides good indication that mixed sources that contain SSBs increase CRP, while most other food sources have no effect with some sources (fruit, 100% fruit juice, sweetened soy beverage or dark chocolate) showing decreases, which may be dependent on energy control.
    Nutrients, 2022 · checked 2026-10-07 · independently re-checked
  46. ev-crbi-11 · Meta-analysis or systematic review · meta-analysis
    The comparator of fructose interventions vs glucose control groups showed no differences for CRP (MD: −0.03 mg/L 95% CI −0.52 to 0.46, I2 = 44%)
    Nutrients, 2018, Effect of Dietary Sugar Intake on Biomarkers of Subclinical Inflammation: A Systematic Review and Meta-Analysis of Intervention Studies · checked 2026-10-07 · independently re-checked
  47. ev-crbi-12 · Randomized controlled trial(s) · randomized controlled trial
    Fasting plasma concentrations of C-reactive protein and IL-6 did not differ significantly at the end of the 3 diet periods.
    Am J Clin Nutr, 2016 · checked 2026-10-07 · independently re-checked
  48. ev-crbi-13 · Randomized controlled trial(s) · randomized controlled trial
    Triglycerides were higher after sucrose than saccharin (p < 0.05), while no differences were seen for cholesterol, apolipoproteins, or CRP.
    Nutrients, 2026 · checked 2026-10-07 · independently re-checked
  49. ev-crbi-14 · Observational data · systematic review
    Benefits of higher fiber and whole-grain intakes suggested by observational studies may reflect confounding.
    Am J Clin Nutr, 2014 · checked 2026-10-07 · independently re-checked
  50. ev-crbi-16 · Position of an expert body · agency evidence map
    Despite the lack of understanding of the mechanisms by which inflammation might increase the risk for or the progression of chronic diseases, some evidence suggests that some nutrients, eg, simple carbohydrates and saturated fat, may promote inflammation.
    US Department of Veterans Affairs, Evidence Synthesis Program, Beyond Diabetes, Obesity, and Cardiovascular Disease: An Evidence Map of Anti-Inflammatory Diet, 2024 · checked 2026-10-07 · independently re-checked
  51. ev-lccon-07 · Meta-analysis or systematic review · meta-analysis
    Overall, 311 of 473 (66%) participants responded to fiber treatment and 134 of 329 (41%) responded to control treatment [RR: 1.48 (95% CI: 1.17, 1.88; P = 0.001); I2 = 57% (P = 0.007)], with psyllium and pectin having significant effects.
    Am J Clin Nutr, 2022 · checked 2026-10-07 · independently re-checked
  52. ev-lccon-09 · Randomized controlled trial(s) · randomized controlled trial
    After 4 weeks, 73 (76%) of 96 participants in the LFTD diet group, 69 (71%) of 97 participants in the low-carbohydrate diet group, and 59 (58%) of 101 participants in the optimised medical treatment group had a reduction of 50 or more in IBS-SSS compared with baseline, with a significant difference between the groups (p=0·023).
    Lancet Gastroenterol Hepatol, 2024 · checked 2026-10-07 · independently re-checked
  53. ev-lccon-10 · Position of an expert body · agency guidance
    not eating enough fiber
    NIDDK, Symptoms & Causes of Constipation (NIH) · checked 2026-10-07 · independently re-checked
  54. ev-lcch-01 · Meta-analysis or systematic review · meta-analysis of RCTs
    According to the GRADE assessment, there is moderate certainty regarding TG and HDL-C, while certainty for LDL-C and TC remains low.
    BMC Cardiovasc Disord, 2026 · checked 2026-10-07 · independently re-checked
  55. ev-lcch-02 · Meta-analysis or systematic review · meta-analysis of RCTs
    The ketogenic diet significantly improves triglycerides and HDL-C but also leads to modest increases in LDL-C.
    Endocr Pract, 2026 · checked 2026-10-07 · independently re-checked
  56. ev-lcch-03 · Meta-analysis or systematic review · meta-analysis of RCTs
    Moderate-carbohydrate diets offered balanced benefits, whereas ketogenic diets produced greater weight loss but greater increases in LDL and total cholesterol.
    Am J Clin Nutr, 2025 · checked 2026-10-07 · independently re-checked
  57. ev-lcch-11 · Mechanistic or laboratory data · case report
    In this case, her LDL-C concentration increased from 142 mg/dL to 555 mg/dL on a VLCD, and her plasma β-sitosterol level was very high at 12.8 mg/L.
    J Clin Lipidol, 2025 · checked 2026-10-07 · independently re-checked
  58. ev-lcch-13 · Position of an expert body · position statement
    The evidence reviewed showed mixed effects on low-density lipoprotein cholesterol levels with some studies showing an increase.
    Journal of Clinical Lipidology, 2019, 13(5):689-711.e1, National Lipid Association scientific statement · checked 2026-10-07 · independently re-checked
  59. ev-crbi-04 · Meta-analysis or systematic review · meta-analysis
    Moderate-carbohydrate diets offered balanced benefits, whereas ketogenic diets produced greater weight loss but greater increases in LDL and total cholesterol.
    Am J Clin Nutr, 2025 · checked 2026-10-07 · independently re-checked
  60. ev-crbi-15 · Observational data · meta-analysis
    Pooled analysis showed that added sugar intake was associated with increased risk of Crohn's disease (OR 1.66; 95% Cl 1.21-2.29; n = 523,730; 14 studies) and ulcerative colitis (OR 1.59; 95% CI 1.25-2.02; n = 787,228; 18 studies).
    United European Gastroenterol J, 2025 · checked 2026-10-07 · independently re-checked
  61. cb-d-18 · Position of an expert body · regulatory text
    no scientifically supported quantitative intake recommendation for added sugars on which a DRV for added sugars can be derived
    FDA, Food Labeling: Revision of the Nutrition and Supplement Facts Labels, proposed rule, 2014 · checked 2026-09-21 · independently re-checked
  62. ev-lccon-01 · Meta-analysis or systematic review · meta-analysis
    The meta‐analysis of the risk ratio of the number of participants per group reporting constipation at three to six months was 1.06 (95% CI 0.81 to 1.38, I2 = 0%, 564 participants, 4 RCTs, very low‐certainty evidence, Analysis 1.24) when comparing the two diet groups.
    Cochrane Database Syst Rev, 2022 · checked 2026-10-07 · independently re-checked
  63. ev-lccon-02 · Meta-analysis or systematic review · meta-analysis
    The meta‐analysis of the risk ratio of the number of participants per group reporting constipation at six months was 1.37 (95% CI 0.86 to 2.18, I2 = 0%, 177 participants, 2 RCTs, very low‐certainty evidence, Analysis 3.19) when comparing low‐carbohydrate and balanced‐carbohydrate diet groups.
    Cochrane Database Syst Rev, 2022 · checked 2026-10-07 · independently re-checked
  64. ev-lccon-05 · Observational data · systematic review
    Constipation was the most frequently reported individual AE within this category, accounting for 23.9% of all recorded AEs.
    BMC Nutr, 2026 · checked 2026-10-07 · independently re-checked
  65. ev-lccon-06 · Randomized controlled trial(s) · randomized controlled trial
    Compared with the HC group, there were significant reductions in the LC group for faecal output (21 (sd 145) v. - 61 (sd 147) g), defecation frequency, faecal excretion and concentrations of butyrate ( - 0.5 (sd 10.4) v. - 3.9 (sd 9.7) mmol/l) and total SCFA (1.4 (sd 40.5) v. - 15.8 (sd 43.6) mmol/l) and counts of bifidobacteria (P < 0.05 time x diet interaction, for all).
    Br J Nutr, 2009 · checked 2026-10-07 · independently re-checked
  66. ev-lccon-08 · Observational data · prospective cohort
    After additional adjustment for cereal fiber, the highest quintile of the LCD score was associated with a 10% (RR: 1.10, 95%CI: 1.02-1.19) increased risk for constipation, compared to the lowest quintile.
    Gastroenterology, 2025 · checked 2026-10-07 · independently re-checked
  67. ev-lcbs-10 · Position of an expert body · guideline
    Very-low-carbohydrate eating plans should be avoided in those taking sodium–glucose cotransporter 2 (SGLT2) inhibitors because of the potential risk of ketoacidosis (105,106).
    American Diabetes Association Professional Practice Committee, 5. Facilitating Positive Health Behaviors and Well-being to Improve Health Outcomes: Standards of Care in Diabetes-2026, Diabetes Care 2026;49(Suppl 1):S89-S131 · checked 2026-10-07 · independently re-checked
  68. ev-lcbs-12 · Position of an expert body · guideline
    Health care professionals should maintain consistent medical oversight of individuals following very-low-carbohydrate eating plans and recognize that insulin and other diabetes medications may need to be adjusted to prevent hypoglycemia, and blood pressure will need to be monitored.
    American Diabetes Association Professional Practice Committee, 5. Facilitating Positive Health Behaviors and Well-being to Improve Health Outcomes: Standards of Care in Diabetes-2026, Diabetes Care 2026;49(Suppl 1):S89-S131 · checked 2026-10-07 · independently re-checked
  69. ev-lcbs-13 · Mechanistic or laboratory data · case report
    Literature investigation revealed that a strict low carbohydrate diet can rarely lead to DKA in the setting of SLGT-2 inhibitor use.
    Clin Med Insights Case Rep, 2022 · checked 2026-10-07 · independently re-checked
  70. ev-lcch-12 · Mechanistic or laboratory data · case series
    Here, we describe a retrospective case series of 14 patients with ketogenic diet-induced hypercholesterolemia who experienced larger-than-expected LDL-C reductions after ezetimibe therapy.
    Lipids Health Dis, 2026 · checked 2026-10-07 · independently re-checked

Review. Last updated 2026-10-08. Reviewed for evidence level, dose and population context, completeness of cautions, and claims a reader could misread. Bioma Learn has no human medical reviewer at this time, and we say so rather than invent one. Methodology. This is information, not medical advice.