Lycopene--found in abundance in watermelon (15 to 30 milligrams per two-cup serving)- is one of the most powerful antioxidants in existence. It has the power to bind with cell-destroying free radicals, rendering them harmless. Watermelon is high in fiber, vitamins A, B6 and C. It tastes wonderful and contains few calories...so you can eat all you want. In fact, the more you eat, the less fattening food you can eat, so you end up losing weight.
Watermelon.org, May 2006.