In March 2019 researchers from Iran and Australia published their review of the medical scientific literature to assess the effect of resveratrol supplementation on body weight, BMI, waist circumference and body fat. A total of 28 studies were included in the review. Results showed that resveratrol supplementation appeared to reduce body weight, BMI and waist circumference. However, no significant effect of resveratrol supplementation on body fat was found. A greater effect on body weight and BMI was observed when the resveratrol dosage was up to 500 mg/day, the supplementation was taken for more than 3 months and when the study was performed on individuals with obesity.
Mousavi SM et al. Resveratrol supplementation significantly influences obesity measures: a systematic review and dose-response meta-analysis of randomized controlled trials. Obes Rev. 2019 Mar;20(3):487-498