Watermelon helps your blood vessels relax and widen

While most people view watermelon as little more than sugar and water, it contains a high concentration of citrulline. This specific amino acid travels to your kidneys, where it is converted into arginine, a precursor to the gas that tells your blood vessels to relax. When these vessels dilate even slightly, the physics of fluid dynamics takes over. Because flow through a tube scales with the fourth power of its radius, a modest ten percent increase in vessel diameter can actually boost your blood flow by nearly forty-six percent.