Consuming large amounts of watermelon has also been correlated with improved cardiovascular function because it improves blood flow via vasodilation (relaxation of blood pressure). Dietary lycopene (from foods like watermelon or tomatoes) reduces oxidative stress which normally reduces the activity of osteoblasts and osteoclasts (the two major bone cells involved in the pathogenesis of osteoporosis) – this means stronger bones for those consuming lycopene-rich foods. Watermelon is also rich in potassium which helps to retain calcium in your body, resulting in stronger bones and joints.