The success of any diet plan is usually measured by the loss in weight which occurs from the onset of the plan. And the more rapid the weight loss, the more successful the diet is assumed to be. However, in most cases, rapid weight losses are temporary, as the weight is regained. Why does this happen? In many cases this may mean that the body’s metabolic and hormonal systems have not had time to adapt–this takes considerable time. And if they have not had time to adapt to a rapid weight loss, the individual is uncomfortable in a way that is difficult to define. This discomfort may manifest itself as an insatiable desire for food. So another diet attempt fails.