Research paper
Stanhope KL, Schwarz JM, Keim NL, Griffen SC, Bremer AA, Graham JL, Hatcher B, Cox CL, Dyachenko A, Zhang W, McGahan JP, Seibert A, Krauss RM, Chiu S, Schaefer EJ, Ai M, Otokozawa S, Nakajima K, Nakano T, Beysen C, Hellerstein MK, Berglund L, Havel PJ. Consuming fructose-sweetened, not glucose-sweetened, beverages increases visceral adiposity and lipids and decreases insulin sensitivity in overweight/obese humans. Journal of Clinical Investigation. 2009 May;119(5):1322-34. DOI: 10.1172/JCI37385. PMID: 19381015. PMCID: PMC2673878.
Why we cite it
A double-blinded, parallel-arm trial with matched groups in 32 overweight and obese adults showing that fructose and glucose have different metabolic effects at equal calorie levels. Over 10 weeks at 25% of energy intake, fructose — but not glucose — increased visceral fat, reduced insulin sensitivity, raised atherogenic lipid markers, and increased hepatic de novo lipogenesis. It is the project’s key human trial for the claim that the type of sugar matters and not only the calories. Its scope is 32 overweight or obese adults aged 40–72 over 10 weeks at 25% of energy — enough to show the divergence it reports, not enough to prove a syndrome-level mechanism. (Corrected 2026-09-10 from ”Human RCT”: the groups ”were matched for sexual phenotype, BMI, and fasting TG and insulin concentrations”, and the paper does not report randomisation.)