There is nothing that will derail your success in healthy eating more than too much sugar, primarily fructose, which is naturally found in fruit. It is linked to diabetes and can rob you of the energy you need to train, if eaten to excess. Foods high in fructose can make your body switch from a fat-burning mode to a fat-storage mode by promoting the formation of long-chain fatty acids that are resistant to being burned as fuel. Of course there is nothing wrong with eating fruit, since it is high in vitamins, minerals, and fiber, but fructose was never meant to be consumed in large quantities.

Bottom line:
If you want to lose weight, eating a lot of fruit will sabotage your diet, so be careful and exercise good judgement. If you are on a rigid training program, eating extremely limited amounts of fruit (2 servings per day, maximum) is wise for that limited time.

This is a little dramatic. While I agree excessive fruit is not conductive to weight loss, there are many things that are MUCH worse. Fruit has it's place in a good diet, primarily pre and post workout, especially if you're eating all natural.

This is better! Keep in mind, fructose does have an impact on your insulin levels (which promotes your body to store) but that's what makes it appropriate for after workouts. However, generally speaking, the glycemic load of fruits is quite a bit lower than other sugary foods of comprable serving sizes...

Duly noted.

Perhaps I'm from a more strict school of eating here - when I am training I am not even allowed to eat carrots as part of my daily vegetable intake because my coach feels they are too high in sugar for the short duration of the program.

Perhaps what I should have said was: eating fruit to excess can lead to weight gain. Sugar is sugar, so make sure you regular it - like everything else.

eating calories in excess leads to weight gain.. Not all fruits have a high GI, GL or insulin index (I put up all 3 because some people are really anal about GI and GL and say that the insulin index is the only thing that "goes"). Sugar is just another sort of nutrient.. sure, you shouldn't eat a lot of it, but all studies that have shown fructose to be evil (all that I've seen) have been using very large amounts that you'll only get if you drink a lot of soft drinks (HFCS) and not fruits.. fruits typically don't contain all that much fructose anyways. I think there's something like 6g in a banana (+ some glucose, ofc)

A small amount of sugar in a complete meal along with fat and protein wouldn't be that big of an issue as the other nutrients will help slow down the sugar.