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.
SugarScience suggests the same limits advocated by the American Heart Association and the World Health Organization: no more than 9 teaspoons a day for men and no more than 6 teaspoons a day for women. But knowing how much sugar you're eating can be challenging. Here are some key facts from the SugarScience website. 1  Added sugar is hiding in 74 percent of packaged foods.  Fructose, a common type of sugar, can damage your liver more than other kinds of sugar â just like too much alcohol can.