Gulp!

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A lovingly sketched and thoroughly researched biography has just come out in paperback. It is a portrait of a dark highway, a story that starts with an aroma and also ends with an aroma. A journey through humanity, a trip through ourselves. “Gulp: Adventures on the Alimentary Canal,” is the latest scientific foray by Mary Roach. And it’s about the gut: what happens to our bodies when we eat and why.