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Calories in Versus Calories Out
The calories in part influences to some extent the calories out part. Some labels are allowed to have a 20% error on them, so it's hard to track exactly how many calories you're taking in. Different foods have different amounts of metabolizable energy. Fiber is anywhere from basically zero to four calories. There's no way to know exactly how many calorie you're getting. The message needs to be calories in versus calories out is real.