How useful watermelon, not to describe in a nutshell. Let's start with the fact that watermelon is the richest source of useful elements in caloric content of only about 38 calories per 100 grams of product. It is no secret that with the help of the berries, you can easily lose a few pounds. Until the sale is still eating watermelons, I suggest you arrange a fasting day and cook healthy and diet smoothies.