(ABCNews) - If you love to sit back and sip a glass of cabernet or pinot noir, you can feel good knowing that the health benefits of red wine are now a little less mysterious. Scientists have uncovered how resveratrol, the chemical found in grape skins, peanuts and dark chocolate, works in mice to help fight several chronic diseases. For the past decade, researchers have been intrigued by the apparent health benefits of resveratrol, which has been shown to fight obesity, type 2 diabetes and cancer in mice and seems to have some health benefits for humans. But no one understood how the chemical worked its magic on the body.