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Objective: To evaluate the efficacy of an orlistat-resveratrol (O-R) combination in subjects with obesity over a 6-month period.Methods: This study was a double-blind, parallel, randomized controlled clinical trial. Patients fulfilling the selection criteria (age from 20 to 60 years and body mass index (BMI) ≥30 and ≤39.9 kg/m(2) ) consumed an energy-reduced diet with 500 fewer calories than their usual diet for 2 weeks. Then the participants were randomly assigned to four groups, placebo, resveratrol, orlistat, or O-R, and they consumed the energy-reduced diet for 6 months. The study consisted of seven visits. During each visit, a 24-h recall was performed, along with measurements of anthropometric and serum biochemical parameters.Results: A total of 161 participants were selected. Of these, 84 participants completed the study. A significant weight loss of -6.82 kg (95% CI -8.37 to -5.26) was observed in the O-R group compared with -3.50 kg (-5.05 to -1.95, P = 0.021) in the placebo group. In contrast, the -6.02 kg (-7.68 to -4.36) orlistat and -4.68 kg (-6.64 to -2.71) resveratrol monotherapy losses did not significantly differ from the placebo. Significant decreases in BMI, waist circumference, fat mass, triglycerides, leptin, and leptin/adiponectin ratio were observed with the O-R combination.Conclusions: The O-R combination was the most effective weight loss treatment. [ABSTRACT FROM AUTHOR]