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.
Limit daily sugar to 6 tsps (25 g) for women, 9 tsps (38 g) for men. Yet, the average American consumes 19.5 teaspoons (82 grams) every day. That translates into about 66 pounds of added sugar consumed each year, per person.