Because watermelon contains a lot of sugar, people who are losing weight are forbidden to eat watermelon. In the first few pounds we lost, what we lost was not fat, but actually water in the body. Watermelon contains a lot of sugar and water, so it is not suitable to lose weight by eating watermelon. If you want to lose weight, you should eat something with low sugar content, such as cucumbers and tomatoes. This is the best way to lose weight.