Not only is watermelon being shown to have a relaxing effect on blood vessels (which is what Viagra was developed to do) but watermelon is an old time natural diuretic.

Researchers believe there may be a link between citrulline (found in watermelon) and arginine which may be of interest to those who want to lose weight.  Researchers are studying the link between relax blooding vessels and reducing the effects of type-2 diabetes.