The real poop on human digestion

I won’t lie: I love Mary Roach‘s books. She is likely the funniest nonfiction writer working today; her beat is the weird side of science. I reviewed her most recent book, Gulp: Adventures on the Alimentary Canal, for Double X Science:

Consider this question a 6-year-old might ask: Why doesn’t the stomach digest itself? After all, the human stomach contains hydrochloric acid, which is uses to break down some pretty tough substances for digestion. The answer, as Roach points out, is that it does: The acid dissolves the lining of the stomach over the course of a few days, but new cells replace the destroyed ones. When a person dies, no new cells are born, leaving the acid to work undeterred…with predictably gross results.

However, Gulp isn’t a gross-out book, though I don’t advise you read the chapter on coprophagia (poop-eating) during lunch, as I did. [Read more…]

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