Nursing and diet. Be careful while dieting and nursing because it could decrease your milk supply. Eat healthy, well-balanced meals. Half or what you eat should be veggies and fruit. Also eat lean proteins like chicken, pork, beans, lentils, and nuts. Carbs should be whole grain, and about a fist-full at each meal. What you eat flavors your milk and helps develops your baby's taste so eat what you want baby to eat.