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Study Suggests Hormones May Be Responsible for Failure to Keep Off Lost Pounds Oct. 26, 2011 -- Just ask anyone who has ever tried to shed extra pounds: Losing weight can be hard, but it's keeping this extra weight off that is often most daunting.

Anyone who has ever dieted knows that lost pounds often return, and most of us assume the reason is a lack of discipline or a failure of willpower. But Proietto suspected that there was more to it, and he decided to take a closer look at the biological state of the body after weight loss.

It's not just willpower, or a lack thereof, that makes us overeat and gain weight. Sometimes, it's that sneaky bad habit you developed without even realizing it, like dashing out the door some mornings without breakfast, or munching chips in front of your favorite TV show.

Some Overweight People May Be Hardwired to Overeat Aug. 1, 2011 -- Willpower alone usually is not enough for lasting weight loss; instead, to counter obesity, some experts now recommend focusing on the ways in which the brain responds to food rather than solely on personal choice.