Fruit by nature is very high in sugar. That's actually why I wouldn't eat any fruit save blueberries (I don't know why blueberries really) when I was restricting. It's different sugar than processed/refined sugars though (which are pretty much concentrated fruit sugars without any other nutritional value and hit more like a xanax whereas if you get sugar eating an apple it's more like a valium. (You know you're a psych patient when you compare how quickly different sugars break down with the varying half lives of benzos.)) Mass wise, an apple has nearly as much sugar as a snickers, but that apple doesn't raise your blood sugar as much or as fast as the snickers because the fiber slows down the rate the carbs are absorbed.