“Watermelon has too much sugar to be healthy.”
Strong confidence because watermelon is mostly water, has low energy density and an ordinary serving has a modest carbohydrate load. Controlled comparisons do not support treating it like a concentrated sugary snack.
Watermelon contains natural sugar, but it is mostly water and an ordinary serving is not a high-calorie sugar bomb. It can fit into a healthy diet.
Glycemic index describes how quickly available carbohydrate acts, but glycemic load also considers how much carbohydrate is in a normal serving.
Eating a bowl of watermelon is different from drinking a large amount of juice or eating a very large portion quickly.
Can watermelon support hydration and fullness?
Yes. Its high water content can make it refreshing and filling for relatively few calories.
You do not need to avoid watermelon because it tastes sweet.
Eat a normal serving and enjoy it as fruit, not as a food you need to earn or fear.