Reason #4: If you regain the lost weight, it'll be even harder to lose it.
A person who repeatedly loses weight only to put it back on can have a cumulative gain in body fat percentage - each time you diet, your body's metabolism slows down in order to store fat.

Hence with each dieting episode, the body's metabolism becomes less efficient, and the severe calorie restriction further causes loss of muscle tone, which again means a slower metabolism.

Together with less muscle mass and a retarded metabolic rate, each successive attempt to shed off those extra kilos becomes more difficult, if not impossible.

Related quiz: What is your diet personality?