I have a friend who is a dedicated calorie counter. In order to control her weight, she carefully notes the calorie value of all the food she eats and the amount of exercise she needs to take to burn it off. If she indulges in an extra treat, she will note it and compensate by working out more the next day, according to a formula that relates the type and duration of exercise to the amount of calories that need to be burned. This requires a lot of bookkeeping but she is a very organized person.
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