Although watermelon certainly has its health benefits, it is fairly high in sugar. It is recommended that those who enjoy eating watermelon limit their consumption of it to around five portions a week at most. This particular fruit is high on the glycemic index or GI which is essentially a scale that measures the affect that the glucose level in certain foods has on the bloodstream.
There are many health benefits to eating watermelon though, such as the high amounts of iron, potassium, vitamin B6, and lycopene which is in it. Those who are trying to limit their sugar intake as much as possible though will want to avoid eating too much watermelon on a regular basis.