Transcript for Diet Discovery: Hormones
Anyone who's tried and knows it losing weight is hard enough keeping it off is even harder. And tonight we learn that the problem may not be a lack of Will Power but a spike in hormones. Researchers -- that discovering The New England Journal of Medicine the question now we do anything about it. ABC's Andrea canning went for answers. Calling think -- -- -- fat diet and exercise work I can bounce upstairs now. And then slowly but surely those pounds creep back. 90% of -- gain the weight back once obese Leisle hatched knows the feeling you aren't. But now a team of researchers publishing in the prestigious new England journal of Madison saying -- don't beat yourself up. It's not just that you are falling into old bad habits your body is actually stacking the deck against GO. They enrolled fifty overweight patients -- a diet program on average the -- lost thirty pounds. When the fight was over and the group started putting the pounds back -- the researchers looked closely at each person's hormones. It turned out keep hormones that contribute to hunger spite making the -- leaders feel hungry. And what's worse their metabolism dropped making it harder for them to burn off food. Scientists don't know why this happens but the Dieter said they could feel it. Complaining they were hungrier after meals as compared to how they felt before they went on the diet. Scientists think we're hard wired to react this way to -- it. It's when you. You lose weight your body thinks you're dying it tries to me to regain that way. So pheromones are part of the problem -- -- also be part of the solution. We'll definitely -- replacement of some of these hormones. And eliminating other hormones in the effort to get people to lose weight. Doctors right now are experimenting with therapies to control hormones in order to stop appetites from spiking. In the meantime after a diet the best approach is eating more proteins which will help rein in your runaway appetite. And of course working out your body even though your body is working against you. Andrea canning ABC news New York.
This transcript has been automatically generated and may not be 100% accurate.