Exercise Beats Diet for Weight Maintenance
A new study on 14 contestants from "The Biggest Loser" reality show found that maintaining weight loss over the long term is more strongly linked to regular exercise than continued dieting. The research adds to growing evidence that staying active is crucial for sustainable weight management and long-term health outcomes.
- The study followed 14 of 16 contestants from the eighth season for six years after the 30-week competition ended. - During the show, contestants consumed as little as 1,000 calories per day while engaging in up to seven hours of daily exercise. - Six years later, the participants' resting metabolisms had slowed significantly, burning an average of about 500 fewer calories per day than expected for their body size, a phenomenon known as "metabolic adaptation." - Despite regaining an average of 90 pounds, those who maintained the most significant weight loss were the most physically active in the years following the show. - The study also found that levels of leptin, a hormone that signals feelings of fullness, plummeted and did not fully recover to pre-show levels, leading to persistent hunger. - The extreme methods on the show led to an average weight loss of 129 pounds in 30 weeks; however, six years later, most had regained a significant amount, with five contestants at or above their starting weight. - Some researchers theorize that the body operates on a "constrained energy model," where after a certain amount of physical activity, the body compensates by reducing the energy it uses for other metabolic processes. - A computational model of the contestants' weight loss suggested that diet alone would have resulted in a loss of 34 kg with 65% from body fat, while exercise alone would have led to a 27 kg loss with 102% from fat (meaning a gain in muscle mass).
