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The reason so many Americans are overweight: It's because they spend 56 hours a week on average sitting on their fat asses, that's why. But what you may have assumed in the past was simply laziness is actually a certifiable medical condition. It's called "sitting disease" or "over-sitting," say health experts. Now we just need a kindly pharmaceutical company to develop a drug for it and we'll be all set, won't we? [NYDN]