Little changes can make a big difference. Eat small, healthy meals throughout the day, so you don't feel sluggish.
Go for foods and snacks that include lean protein, whole grains, veggies, or fruit. Try an apple with peanut butter, or some tuna on whole-grain bread.
Is your idea of breakfast a cup of coffee? Add a hard-boiled egg, a cup of yogurt, or a banana to your morning.