As its name suggests, watermelon is an excellent way to hydrate in the morning. What's less well known is this juicy fruit is among the best sources of lycopene—a nutrient found in red fruits and vegetables that's important for vision, heart health, and cancer prevention.
Best of all, watermelon contains just 40 calories per cup, landing it on lists of so-called negative-calorie foods that supposedly burn more calories during digestion than they add in. (Actually, it's a bit more complicated than that, but that's no reason to not eat watermelon!)