Watermelon doesn't boast the most impressive fiber content. It is loaded with water, and it has special minerals called electrolytes that are just what your body needs to recharge after some time in the sun. Watermelon is rich in an amino acid called citrulline that may help move blood through your body and can lower your blood pressure. Your heart also enjoys the perks of all the lycopene watermelon contains. Studies show that it may lower your risk of heart attacks.