Eat the healthiest diet you can. Eat fresh fruits and vegetables, whole grains and lean protein. Healthy foods help keep you strong, give you more energy and support your immune system. If you're nauseated, try eating small meals throughout the day. Choose foods that are soothing and easy to digest, such as soups, broths or a plain baked potato. A registered dietitian can be especially helpful if you have weight loss or trouble eating.