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Gulp. Adventures on the Alimentary Canal by Mary Roach takes us down the hatch on an unforgettable tour. Why is crunchy food so appealing? Why is it so hard to find words for flavours and smells? Why doesn't the stomach digest itself? How much can you eat before your stomach bursts? Can constipation kill you? Did it kill Elvis? In Gulp we meet scientists who tackle the questions no one else thinks of or has the courage to ask. We go on location to a pet-food taste-test lab, a fecal transplant, and into a live stomach to observe the fate of a meal.