Watermelon is a sweet and refreshing low calorie summer snack. It provides hydration and also essential nutrients, including vitamins, minerals, and antioxidants.Watermelon is around 90% water, which makes it useful for staying hydrated in the summer. It can also satisfy a sweet tooth with its natural sugars.Watermelon also contains antioxidents. These substances can help remove molecules known as free radicals, or reactive species, from the body. The body produces free radicals during natural processes, such as metabolism. They can also develop through smoking, air pollution,stress and other environmental pressures.