Of course, a number of individual factors can also play a role in whether it's appropriate to exercise while fasting, such as your age, when you last ate, whether or not you're pregnant, taking medications, your medical history, level of fitness, and the type of workout you engage in.
Children should consume no more than 12 grams (92 calories) or 3 teaspoons of added sugar per day, according to the American Heart Association. Teens should consumer no more than 18-37 grams (138-285 calories) or 5 teaspoons of added sugar each day.
The recommended daily sugar intake pertains to the amount of added sugars you consume. The American Heart Association suggests limiting added sugars to 6 teaspoons a day for women and 9 teaspoons a day for men. Keep in mind that added sugar takes many forms on ingredient lists, including high-fructose corn syrup, cane sugar, molasses, honey and fruit concentrate.