Comment by fastoptimizer

There hasn't been a study showing that calorie controlled fruit diet will cause you any harm (except potential malnutrition if fruit selection is not as varied).

Just like excessive consumption of protein (but with a calorie cap) in healthy people shows no harm, or similar studies on healthy, physically active people.

Diet is just a part of a healthy lifestyle and a huge variety of diets can be healthy. This blaming of particular ingredient or macronutrients is unscientific, I as a skeptic dislike it very much.

Fruits are rich in fiber which slows down the absorption of their more "potent" sugars, not to mention that digestion of that fiber is far more taxing than digestion of something else.

Of course, if I were to eat excessive amount of calories it's quite probable I'd get the same symptoms as those people consuming the equivalent in refined sugars.