Walk in the Sun Or sit in a sunny window if you can’t get out. Exposing yourself sunlight boosts production of the feel-good brain chemical serotonin, which can curb cravings. “When serotonin production is low, people tend to crave high-calorie, high-fat carbohydrates such as cakes, cookies and chips,” says Janice Taylor, a weight-loss coach in New York City and author of Our Lady of Weights Loss.