Eating watermelon in summer can clear away heat and relieve summer heat. Because watermelon contains a lot of water, it can clear away heat and relieve summer heat, remove troubles and quench thirst. Sugar and salt can induce diuresis and eliminate kidney inflammation. Protease can transform insoluble protein into soluble protein. After eating watermelon, the urine volume will increase obviously, thus reducing the content of bile pigment and making the stool unobstructed, which has a certain effect on treating jaundice. Fresh watermelon juice and smooth watermelon skin can increase skin elasticity and reduce wrinkles.