The participants (average ages of 20–77) included adults with no known health conditions as well as adults with cardiometabolic diseases.

The interventions included fresh grapes, raisins, grape juice, grape extract, grape pomace, and grape powder. The intervention durations ranged from 3 to 24 weeks.

The studied outcomes were BMI, body fat, weight, hip circumference, waist circumference, waist-hip ratio, adiponectin, and leptin. Supplementation with grapes or grape products reduced BMI to a trivial degree (−0.14). The certainty of evidence was very low for all of the outcomes.

Do grapes or grape products have antiobesity effects? Original paper