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.
It is estimated that 1 1/2 cups of watermelon contains between 9 and 13 grams of lycopene. A cup of watermelon contains 50 calories, 15 mg Vitamin C, 585 IU Vitamin A, and 186 mg potassium. With all this in mind, watermelon is a healthy fruit that can give rise to side effects if eaten in too much abundance.