Resveratrol May Prevent Weight Gain

Resveratrol, the polyphenol found in wine, red grapes and in high amounts in other plants, when fed as a supplemented to lemurs, was shown to cause a reduction in seasonal body mass gain by helping to decrease the animals food intake and increase the primate's body temperature, thereby indicating it had an effect on the animal's metabolism.

Source: Resveratrol suppresses body mass gain in a seasonal non-human primate model of obesity