Effect of resveratrol supplementation on hepatic steatosis and cardiovascular indices in overweight subjects with type 2 diabetes: a double-blind, randomized controlled trial

BACKGROUND: Patients with type 2 diabetes mellitus (T2DM) are prone to develop non-alcoholic fatty liver disease (NAFLD) and cardiovascular diseases (CVD). We aimed to investigate whether the resveratrol supplementation improves novel hepatic and cardiovascular indices in these patients. METHODS: We conducted a double-blind, randomized controlled trial for 8 weeks. Seventy-six patients with T2DM were randomly assigned to receive 1000 mg/day resveratrol or placebo. Levels of lipid accumulation product (LAP), visceral adiposity index (VAI), Castelli risk index I (CRI-I), CRI-II and atherogenic coefficient (AC) were measured at the beginning and after intervention. RESULTS: A total of 71 participants completed the trial. After adjusting for confounding factors including medications, diabetes duration, energy intake and physical activity, no significant difference was found between the intervention group and the control group in LAP (mean change: − 2.46 ± 23.3 vs. 1.43 ± 14.3; P = 0.43), VAI (mean change: − 0.25 ± 1.1 vs. − 0.02 ± 0.6; P = 0.47), CRI-I (mean change: − 0.25 ± 0.9 vs. − 0.09 ± 0.5; P = 0.79), CRI-II (mean change: − 0.23 ± 0.7 vs. − 0.06 ± 0.6; P = 0.38) and AC (mean change: − 0.25 ± 0.9 vs. − 0.09 ± 0.5; P = 0.79). CONCLUSIONS: Resveratrol supplementation had no effect on hepatic steatosis and cardiovascular indices. Further clinical trials, especially among subjects with dyslipidemia are needed to reach a firm conclusion. In addition, taking all medications should be controlled in future studies. Trial registration The protocol was registered on 29/12/2017 at the Iranian clinical trials website (IRCT20171118037528N1) with URL: https://en.irct.ir/trial/27734.