It depends. Naturally sweet foods, such as fruit, offset their calories with a bounty of vitamins, minerals, and fiber. In contrast, foods with copious amounts of added sugar (soda, sports drinks, cookies, candy, etc.) not only make you fat buy may also increase heart disease and cancer risk, among other things.
The American Heart Association suggests that active guys who eat 3,000 calories a day limit their daily sugar intake to 300 calories, max. That's about 72 grams, or 18 level teaspoons (the amount found in 16 ounces of soda and a large bowl of Fruit Loops).
Check labels for sugar content; just remember labels for dairy foods can be misleading. Lactose, a naturally occurring carb in milk, is classified as sugar, so the numbers will look inflated.