Watermelon, because of its water and fiber content, helps to prevent and promote regularity for a healthy digestive tract.It contains only 46 calories per cup, but is high in vitamin C, vitamin A and many healthy plant compounds.Eating water-rich and fiber-rich fruits and vegetables, including watermelon, can be very helpful for promoting normal bowel movements.

Watermelon also contains thiamine, riboflavin, niacin, vitamin B-6, folate, pantothenic acid, magnesium, phosphorus, potassium, zinc, copper, manganese, selenium, choline, lycopene, and betaine. According to the National Watermelon Promotion Board, watermelon contains more lycopene than any other fruit or vegetable.