The struggle of many 'Biggest Loser' winners to stay fit highlights 5 key principles for losing weight and keeping it off

A recent study that followed a group of winners from the reality TV series "The Biggest Loser" came to some bleak conclusions:

Six years after the show ended, 13 out of 14 contestants in the study had regained a significant amount of weight. Four of them are heavier today than they were before the show began.

The results highlight a disheartening reality: Losing weight is hard work, but keeping it off is harder - especially if you're significantly overweight.

Still, the study's somber findings also draw attention to some key principles that anyone looking to losing weight and stay fit can follow: