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Scientists have found intriguing evidence that one major reason so many people are overweight these days may be as close as the seat of their pants. Literally. According to the researchers, most of us sit too much.

In most cases, exercise alone, according to a team of scientists at the University of Missouri, isn't enough to take off those added pounds. The problem, they say, is that all the stuff we've heard the last few years about weight control left one key factor out of the equation. When we sit, the researchers found, the enzymes that are responsible for burning fat just shut down.