This is a debate I have often had with myself as I eat a lot of fruit per day and have done some research... like any other topic there are positive and negative sides to each argument.

There is a lot of evidence that large amounts of fructose can cause harm when consumed in excess. However, this depends on the dosage and context and does not apply to fruit.

Whole fruits contain a relatively small amount of fructose and they take a while to chew and digest. Humans can easily tolerate the small amounts of fructose found in fruit. (that said I do have a habit of smoothies as I am busy busy busy)

Fruits also contain large amounts of important nutrients, including fiber, vitamins, minerals and various antioxidants and phytonutrients.

Fruits like apples and oranges are among the most fulfilling foods you can eat. Eating more of them should lead to an automatic reduction in calorie intake.

As far as I can find the main reasons to avoid fruit include some sort of intolerance, or being on a very low-carb / ketogenic diet.

So for me its about weighing up the pros and cons... and I will continue to eat as much fruit as I do now.

It may be helpful for you to look up sugar content (fructose) in the fruits you eat most and try to replace them with lower sugar content if the amount of sugar is what worries you. For me the positives of eating fruit far outweigh the negatives.