UCP1 and type 2 diabetes mellitus: An in vivo study demonstrated that melatonin at 10 mg/kg could induce white adipose tissue browning in rats with obesity-related type 2 diabetes by increasing the uncoupling protein 1 (UCP1) and PGC-1α, the thermogenic proteins, which possibly provided the reasons why melatonin was considered as a contributor to control body weight without effects on food intake and physical activity levels [282].