5 doctors weighed in: Does alcohol thin the blood? 5 doctors weighed in Want a second opinion? Blood actually doesn't get thinned.  what we call blood thinners are agents that decrease the ability of the blood to clot, usually used in people whose blood clots excessively.
However, due to its very high water content, the same amount of watermelon that provides us with 16% of the DRI for vitamin C only costs us about 46 calories, or about 2% of our total daily calories on a 1800-2000 calorie diet.
Watermelons are an excellent source of several vitamins: vitamin A, which helps maintain eye health and is an antioxidant; vitamin C, which helps strengthen immunity, heal wounds, prevent cell damage, promote healthy teeth and gums; and vitamin B6, which helps brain function and helps convert protein to energy.