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.
Sugar Recommendations. The American Heart Association has specific limits for how much added sugar you should consume in one day. Women should limit added sugar consumption to 6 teaspoons, or about 100 calories. Men should limit sugar intake to 9 teaspoons, or approximately 150 calories. Just one can of soda contains about 8 teaspoons of sugar, well over the entire daily recommendation for women.