Many holiday favorites are packed with nutrients. For example, sweet potatoes supply potassium and fiber and are loaded with the antioxidant vitamin A, which is important for a healthy immune system. Cranberries are high in vitamin C and may help fight urinary tract infections. Dried fruit and turkey can also be nutritious options. Try preparing foods that are nutritious and satisfying yet low in calories. Reducing the amount of fat and calories in meals can also help prevent weight gain. Create healthier versions of favorite baked goods by using fat-free milk instead of whole milk and applesauce in place of oil. Sweeten your beverage, casserole or dessert with a low-calorie sweetener. To thicken a liquid without adding fat, use one of the following: flour, cornstarch, potato flakes, yogurt or fat-free evaporated milk.