If you just burn more calories than you eat, you can lose weight, right? How many times have you heard this? Have you ever tried to lose weight this way? Were you successful? For some blessed individuals this is actually enough. For the rest of us... well, it turns out that metabolism is far more complicated than the simple arithmetic of calorie in calorie out. We are not pure calorie-burning machines. We are an intricate system of biology, hormones, genetics, and even bac