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Is it better to lose weight by exercising or dieting? A study from the University of Michigan suggests that you need a combination of both.
Professor Steve Ball kept track of one group of women who joined a gym and another group who joined Weight Watchers. The women underwent CT scans at the beginning and end of the three-month study.
The Weight Watchers lost 5% of their body weight or an average of nine pounds. However, they did not lose fat but lean tissue.
The gym members did not lose any weight, but they lost significant amounts of belly fat and fat around their vital organs.
Professor Ball said lean tissue is necessary for a healthy metabolism.
"If you diet but don't exercise, you're going to lose lean tissue and your metabolism will drop," he said. "When you get tired of your diet and you start eating with a slower metabolism, you will gain the weight back." He believes that the best way to maintain a healthy weight is both to watch what you eat and have a structured exercise program.