A pepper a day may keep the doctor away. Capsaicin, which is the active ingredient in hot red chili peppers, is thought to lower triglycerides, trigger the release of endorphins, and improve digestion by stimulating stomach secretions. It also dilates and relaxes blood vessel walls, which means more oxygen to all parts of the body. And by increasing circulation, it signals the brain to release neuropeptides in the body, which inhibit pain and inflammation. So eat your chilis, and you'll walk away warmer, leaner, and with less pain.