Due to its high water content, watermelon is a natural laxative, especially when enjoyed in large quantities. According to the National Watermelon Promotion Board, watermelons are 92 percent water.
In addition to its benefit as a natural laxative, watermelon aids in the prevention of kidney stones, according to Natural News. Watermelon contains essential vitamins and trace minerals such as vitamins A, B6 and C and potassium. These vital nutrients support a healthy immune system, uninterrupted digestion, formulation of healthy red and white blood cells, and eye health.
Other high-fiber fruits that contain essential vitamins and support healthy digestion include figs, prunes, grapes and raisins.