If you continually diet you are putting your body in a quasi-famine situation. It slows your metabolism down and breaks the thermostat. Diets don't work. They don't help you understand why you're eating more than your body wanted in the first place.
My home State of North Carolina ranks 12th in the United States for increased aging population and according to a national report 41st in overall health. According to this same report individuals aged 50+ are the least healthy.