Well, the calorie estimate is also just that, an estimate. So you don't even know what the real number is. Still I have found that it gives you enough of a heu

Well, the calorie estimate is also just that, an estimate. So you don't even know what the real number is. Still I have found that it gives you enough of a heuristic to be effective when you do pay close attention. (Source: I lost 100 lbs over 18 months)