The references below support the finding published as Volume I. Every journal citation was verified against the United States National Library of Medicine’s PubMed database prior to publication; guidance documents were verified with their issuing bodies. The Institute invites the skeptical reader — and hopes all its readers are skeptical — to follow the links.
Systematic Reviews and Meta-analyses
1. Te Morenga L, Mallard S, Mann J. Dietary sugars and body weight: systematic review and meta-analyses of randomised controlled trials and cohort studies. BMJ 2012;346:e7492. doi:10.1136/bmj.e7492. PMID 23321486.
The WHO-commissioned review: reducing free-sugar intake in adults eating freely was followed by an average 0.80 kg weight loss; increasing it, a 0.75 kg gain.
2. Malik VS, Pan A, Willett WC, Hu FB. Sugar-sweetened beverages and weight gain in children and adults: a systematic review and meta-analysis. Am J Clin Nutr 2013;98(4):1084-1102. doi:10.3945/ajcn.113.058362. PMID 23966427.
Trials that added sugary drinks produced +0.85 kg; each daily serving tracks with measurable annual weight gain in children and adults.
3. Malik VS, Schulze MB, Hu FB. Intake of sugar-sweetened beverages and weight gain: a systematic review. Am J Clin Nutr 2006;84(2):274-288. doi:10.1093/ajcn/84.1.274. PMID 16895873.
Across epidemiologic and experimental evidence, greater sugary-drink consumption is associated with weight gain and obesity.
4. Vartanian LR, Schwartz MB, Brownell KD. Effects of soft drink consumption on nutrition and health: a systematic review and meta-analysis. Am J Public Health 2007;97(4):667-675. doi:10.2105/AJPH.2005.083782. PMID 17329656.
An 88-study review linking soft-drink intake to increased energy intake and body weight.
5. Luger M, Lafontan M, Bes-Rastrollo M, Winzer E, Yumuk V, Farpour-Lambert N. Sugar-Sweetened Beverages and Weight Gain in Children and Adults: A Systematic Review from 2013 to 2015. Obes Facts 2017;10(6):674-693. doi:10.1159/000484566. PMID 29237159.
Of prospective cohort studies covering 242,352 people, 96% found sugary-drink intake positively associated with obesity measures.
6. Malik VS, Popkin BM, Bray GA, Despres JP, Willett WC, Hu FB. Sugar-sweetened beverages and risk of metabolic syndrome and type 2 diabetes: a meta-analysis. Diabetes Care 2010;33(11):2477-2483. doi:10.2337/dc10-1079. PMID 20693348.
One to two sugary drinks per day was associated with 26% higher risk of type 2 diabetes.
7. Hu FB. Resolved: there is sufficient scientific evidence that decreasing sugar-sweetened beverage consumption will reduce the prevalence of obesity and obesity-related diseases. Obes Rev 2013;14(8):606-619. doi:10.1111/obr.12040. PMID 23763695.
Concludes the evidence that decreasing sugary drinks will decrease obesity is compelling.
8. Hu FB, Malik VS. Sugar-sweetened beverages and risk of obesity and type 2 diabetes: epidemiologic evidence. Physiol Behav 2010;100(1):47-54. doi:10.1016/j.physbeh.2010.01.036. PMID 20138901.
Sugary-drink trends parallel obesity trends; replacing them with water reduces risk.
9. Malik VS, Hu FB. The role of sugar-sweetened beverages in the global epidemics of obesity and chronic diseases. Nat Rev Endocrinol 2022;18(4):205-218. doi:10.1038/s41574-021-00627-6. PMID 35064240.
Strong evidence from cohort studies supports a causal role of sugary drinks in weight gain and cardiometabolic disease.
Cohort Studies
10. Mozaffarian D, Hao T, Rimm EB, Willett WC, Hu FB. Changes in diet and lifestyle and long-term weight gain in women and men. N Engl J Med 2011;364(25):2392-2404. doi:10.1056/NEJMoa1014296. PMID 21696306.
120,877 adults followed for up to 20 years: sugar-sweetened beverages were among the foods most strongly associated with creeping long-term weight gain.
11. Schulze MB, Manson JE, Ludwig DS, Colditz GA, Stampfer MJ, Willett WC, Hu FB. Sugar-sweetened beverages, weight gain, and incidence of type 2 diabetes in young and middle-aged women. JAMA 2004;292(8):927-934. doi:10.1001/jama.292.8.927. PMID 15328324.
Women who increased sugary-drink intake gained about 4.7 kg over four years.
12. Ludwig DS, Peterson KE, Gortmaker SL. Relation between consumption of sugar-sweetened drinks and childhood obesity: a prospective, observational analysis. Lancet 2001;357(9255):505-508. doi:10.1016/S0140-6736(00)04041-1. PMID 11229668.
Each additional daily sugary drink carried 1.6 times the odds of obesity in children over about 19 months.
Randomized Controlled Trials
13. de Ruyter JC, Olthof MR, Seidell JC, Katan MB. A trial of sugar-free or sugar-sweetened beverages and body weight in children. N Engl J Med 2012;367(15):1397-1406. doi:10.1056/NEJMoa1203034. PMID 22998340.
Double-blind trial in 641 children: masked replacement of one sugary drink a day reduced 18-month weight gain by about 1 kg. The cleanest causal evidence in the literature.
14. Ebbeling CB, Feldman HA, Chomitz VR, et al. A randomized trial of sugar-sweetened beverages and adolescent body weight. N Engl J Med 2012;367(15):1407-1416. doi:10.1056/NEJMoa1203388. PMID 22998339.
Eliminating sugary drinks for a year produced significantly smaller weight gain in overweight adolescents.
15. Ebbeling CB, Feldman HA, Osganian SK, et al. Effects of decreasing sugar-sweetened beverage consumption on body weight in adolescents: a randomized, controlled pilot study. Pediatrics 2006;117(3):673-680. doi:10.1542/peds.2005-0983. PMID 16510646.
Replacing sugary drinks with noncaloric ones reduced BMI most in the heaviest participants.
16. Chen L, Appel LJ, Loria C, et al. Reduction in consumption of sugar-sweetened beverages is associated with weight loss: the PREMIER trial. Am J Clin Nutr 2009;89(5):1299-1306. doi:10.3945/ajcn.2008.27240. PMID 19339405.
Cutting one sugary drink a day was associated with roughly half a kilogram lost at six months. Liquid calories mattered more than solid ones.
17. Tate DF, Turner-McGrievy G, Lyons E, et al. Replacing caloric beverages with water or diet beverages for weight loss in adults: the CHOICE randomized clinical trial. Am J Clin Nutr 2012;95(3):555-563. doi:10.3945/ajcn.111.026278. PMID 22301929.
Replacing caloric beverages with water or noncaloric alternatives produced 2 to 2.5% weight loss at six months.
18. Raben A, Vasilaras TH, Moller AC, Astrup A. Sucrose compared with artificial sweeteners: different effects on ad libitum food intake and body weight after 10 wk of supplementation in overweight subjects. Am J Clin Nutr 2002;76(4):721-729. doi:10.1093/ajcn/76.4.721. PMID 12324283.
Ten weeks of added sucrose, mostly as drinks, increased weight and fat; the comparison group lost weight.
19. Hall KD, Ayuketah A, Brychta R, et al. Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain: An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake. Cell Metab 2019;30(1):67-77. doi:10.1016/j.cmet.2019.05.008. PMID 31105044.
On an ultra-processed diet, inpatients spontaneously ate about 508 extra calories a day and gained 0.9 kg in two weeks; the unprocessed diet produced the mirror-image loss.
Mechanism: Liquid Calories and Satiety
20. DiMeglio DP, Mattes RD. Liquid versus solid carbohydrate: effects on food intake and body weight. Int J Obes Relat Metab Disord 2000;24(6):794-800. doi:10.1038/sj.ijo.0801229. PMID 10878689.
Liquid carbohydrate promotes positive energy balance; the same carbohydrate as solid food elicits precise compensation. Why sugary drinks are uniquely fattening.
21. Pan A, Hu FB. Effects of carbohydrates on satiety: differences between liquid and solid food. Curr Opin Clin Nutr Metab Care 2011;14(4):385-390. doi:10.1097/MCO.0b013e328346df36. PMID 21519237.
Liquid carbohydrates produce less fullness than solid forms, raising total intake.
22. Bray GA, Nielsen SJ, Popkin BM. Consumption of high-fructose corn syrup in beverages may play a role in the epidemic of obesity. Am J Clin Nutr 2004;79(4):537-543. doi:10.1093/ajcn/79.4.537. PMID 15051594.
The rise of high-fructose corn syrup in beverages mirrors the rapid rise in obesity.
23. Stanhope KL. Sugar consumption, metabolic disease and obesity: The state of the controversy. Crit Rev Clin Lab Sci 2016;53(1):52-67. doi:10.3109/10408363.2015.1084990. PMID 26376619.
Excess sugar promotes cardiometabolic disease via weight gain and via direct hepatic fructose metabolism.
24. Yang Q, Zhang Z, Gregg EW, Flanders WD, Merritt R, Hu FB. Added sugar intake and cardiovascular diseases mortality among US adults. JAMA Intern Med 2014;174(4):516-524. doi:10.1001/jamainternmed.2013.13563. PMID 24493081.
Most American adults exceed recommended added-sugar intake; the highest consumers had double the cardiovascular mortality risk of the lowest.
25. Hall KD, Heymsfield SB, Kemnitz JW, Klein S, Schoeller DA, Speakman JR. Energy balance and its components: implications for body weight regulation. Am J Clin Nutr 2012;95(4):989-994. doi:10.3945/ajcn.112.036350. PMID 22434603.
The consensus statement on energy balance: weight change follows the arithmetic of intake and expenditure.
Ultra-Processed Foods
26. Monteiro CA, Cannon G, Levy RB, et al. Ultra-processed foods: what they are and how to identify them. Public Health Nutr 2019;22(5):936-941. doi:10.1017/S1368980018003762. PMID 30744710.
Defines the ultra-processed category, which includes most products high in added sugar.
27. Pagliai G, Dinu M, Madarena MP, Bonaccio M, Iacoviello L, Sofi F. Consumption of ultra-processed foods and health status: a systematic review and meta-analysis. Br J Nutr 2021;125(3):308-318. doi:10.1017/S0007114520002688. PMID 32792031.
The heaviest ultra-processed-food consumers showed 25% higher all-cause mortality.
28. Lane MM, Gamage E, Du S, et al. Ultra-processed food exposure and adverse health outcomes: umbrella review of epidemiological meta-analyses. BMJ 2024;384:e077310. doi:10.1136/bmj-2023-077310. PMID 38418082.
An umbrella review of 45 meta-analyses linking ultra-processed food to cardiometabolic harm and mortality.
29. Popkin BM, Hawkes C. Sweetening of the global diet, particularly beverages: patterns, trends, and policy responses. Lancet Diabetes Endocrinol 2016;4(2):174-186. doi:10.1016/S2213-8587(15)00419-2. PMID 26654575.
Documents the worldwide growth of sweetened-beverage sales and the policy case against them.
The Debate, Honestly Acknowledged
30. Sievenpiper JL, de Souza RJ, Mirrahimi A, et al. Effect of fructose on body weight in controlled feeding trials: a systematic review and meta-analysis. Ann Intern Med 2012;156(4):291-304. doi:10.7326/0003-4819-156-4-201202210-00007. PMID 22351714.
Fructose swapped calorie-for-calorie for other carbohydrates does not cause weight gain; it does when it supplies excess calories. The calories do the work.
31. Kaiser KA, Shikany JM, Keating KD, Allison DB. Will reducing sugar-sweetened beverage consumption reduce obesity? Evidence supporting conjecture is strong, but evidence when testing effect is weak. Obes Rev 2013;14(8):620-633. doi:10.1111/obr.12048. PMID 23742715.
The published counterpoint: the trial evidence for population-level obesity reduction is weaker than the cohort evidence suggests. Included because the Institute said it would be honest.
32. Khan TA, Sievenpiper JL. Controversies about sugars: results from systematic reviews and meta-analyses on obesity, cardiometabolic disease and diabetes. Eur J Nutr 2016;55(Suppl 2):25-43. doi:10.1007/s00394-016-1345-3. PMID 27900447.
Argues sugars behave no differently from other digestible carbohydrates and cause weight gain only via excess calories.
33. Hall KD. A review of the carbohydrate-insulin model of obesity. Eur J Clin Nutr 2017;71(3):323-326. doi:10.1038/ejcn.2016.260. PMID 28074888.
Controlled feeding studies failed to support key predictions of the carbohydrate-insulin model.
34. Ludwig DS, Ebbeling CB. The Carbohydrate-Insulin Model of Obesity: Beyond Calories In, Calories Out. JAMA Intern Med 2018;178(8):1098-1103. doi:10.1001/jamainternmed.2018.2933. PMID 29971406.
The opposing view: high-glycemic carbohydrates, including sugar, may drive fat storage and hunger hormonally.
35. Hall KD, Farooqi IS, Friedman JM, et al. The energy balance model of obesity: beyond calories in, calories out. Am J Clin Nutr 2022;115(5):1243-1254. doi:10.1093/ajcn/nqac031. PMID 35134825.
The reader will notice that no party to this debate recommends eating more sugar.
36. Lustig RH, Schmidt LA, Brindis CD. Public health: The toxic truth about sugar. Nature 2012;482(7383):27-29. doi:10.1038/482027a. PMID 22297952.
A prominent commentary arguing sugar warrants societal controls like alcohol. An opinion piece; cited as such.
Authoritative Guidance
37. Johnson RK, Appel LJ, Brands M, et al.; American Heart Association. Dietary sugars intake and cardiovascular health: a scientific statement from the American Heart Association. Circulation 2009;120(11):1011-1020. doi:10.1161/CIRCULATIONAHA.109.192627. PMID 19704096.
Sets the AHA limits: no more than about 100 calories a day of added sugar for most women, 150 for most men.
38. Vos MB, Kaar JL, Welsh JA, et al.; American Heart Association. Added Sugars and Cardiovascular Disease Risk in Children: A Scientific Statement From the American Heart Association. Circulation 2017;135(19):e1017-e1034. doi:10.1161/CIR.0000000000000439. PMID 27550974.
Children should consume no more than 25 grams of added sugar a day.
39. World Health Organization. Guideline: Sugars intake for adults and children. Geneva: WHO; 2015. ISBN 978-92-4-154902-8.
The strong recommendation: free sugars below 10% of total energy; ideally below 5%, about 25 grams a day.
40. Scientific Advisory Committee on Nutrition. Carbohydrates and Health Report. London: Public Health England; 2015.
The United Kingdom's advisory body: free sugars should not exceed 5% of dietary energy.
41. U.S. Department of Agriculture and U.S. Department of Health and Human Services. Dietary Guidelines for Americans, 2020-2025. 9th ed.; 2020.
Limit added sugars to less than 10% of daily calories from age 2; none at all before age 2.
42. U.S. Department of Agriculture and U.S. Department of Health and Human Services. Dietary Guidelines for Americans, 2025-2030; 2025.
The current edition goes further: added sugars are not recommended as part of a healthy diet.
The Institute’s interpretation of this literature occupies one sentence. The literature itself is above.