50 reasons your are not in shape -A Weight loss Overview.
The typical view of weight loss is a calories in versus calories out game. This works fine in theory but does not pan out in reality. I have seen client after client come to me after a long period of healthy eating and controlled calories. Despite this they still had not lost the weight.
This is because the body does not have to use up excess fat to bridge an energy deficit. It can instead use stored glycogen (carbs), protein or simply reduce the metabolic process within the body to save energy. This comes at the expense of your health.