Gulp: Adventures on the Alimentary Canal

This book examines the digestive process, from how the food tastes going in to the problems that can arise when it's supposed to come out, in trademark Mary Roach fashion, which is to say with humor and curiosity. Her style is definitely pop science, and there are plenty of poop and fart jokes, but she's clearly done her homework and spends time talking to actual researchers in the field. It's a fun read and I even learned some things!