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.
Watermelon is low in calories and tastes delicious on a hot summer day. This refreshing fruit is high in vitamin A and vitamin C, and is also a good source of fiber. Watermelons are moderately high in sugar, but small amounts can be part of a diabetic-friendly diet. It is best to measure carefully, however, as a wedge of watermelon could be equal to several servings. 1 cup diced watermelon: 46 calories, 0.6 grams fiber, 11.5 grams carbohydrates.