Plenty of fruits and vegetables Whole grains such as oats, brown rice, barley, and quinoa Lean protein such as fish, skinless chicken, egg whites, and beans Low-fat or non-fat dairy products Healthy fats like those in nuts, avocados, and olive oil "That's what you want to eat, a varied diet including those components," Gans says. "I tell my clients to picture a dinner plate. One-quarter of the plate should contain high-fiber carbohydrates like whole grains, one-quarter should contain lean protein sources, and the remaining half should contain fruits and vegetables." To help your body better process food and function at its best, you also need to make sure you drink plenty of fluids. Water is better than caffeinated drinks like coffee and cola. Aim to drink 1 ounce of liquid for every 2 pounds of body weight each day; that means if you weigh 180 pounds, you should drink 90 ounces of water, or about 11 8-ounce glasses. What Not to Eat...