Organic watermelons have high antioxidant, flavonoid and lycopene content. They’re also a good source of vitamin C, which may help your immune system produce antibodies to fight disease, and vitamin A, which may help boost eye health and lower the risk for eye diseases, such as macular degeneration and cataracts. Potassium, although found in relatively small amounts in watermelon,  may help balance fluids in your cells. Low potassium levels sometimes cause muscle cramps.

One of the natural chemicals in watermelons is citrulline, which converts in the kidneys to arginine, an amino acid that plays a role in maintaining good heart health and immune function. The more this conversion takes place, the less fat is likely to accumulate in the cells, helping reduce the risk of obesity and Type 2 diabetes. Arginine may also help remove ammonia and other toxicities from your body.

Another anti-inflammatory phytonutrient in watermelons is cucurbitacin E, a triterpenoid that blocks the activity of pain-, fever- and inflammation-causing enzyme cyclooxygenase. Cucurbitacin E also neutralizes nitrogen-containing molecules in the body.