Ever wonder why your dog can gobble, lick, and gnaw all he wants along the glorious buffet of a city street and (almost) never get sick? Your dog is used to eating shit. Americans, on the other hand, grow up eating almost no shit at all. Our food is hosed and boiled and rinsed and detoxified and frozen and salted and preserved. Recently, we have begun to irradiate it, too—just in case. As a result, when our bodies encounter the occasional inevitable bug, they're unhappy. Our centuries-long program of winnowing out all the muck has turned us into sissies and withered the substantial part of the immune system mediated by our intestinal tract.
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