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.
For most adults, this works out to be no more than 50g or 12 teaspoons of sugar per day (1 teaspoon holds about 4g of sugar), from all sources of food and drink. However, Australians currently consume about 30 teaspoons of sugar a day on average â more than double the recommended amount!