Replaceable You: Adventures in Human Anatomy

by Mary Roach

He suspects that what’s lacking might be short-chain fatty acids. Milk products are a good source, but how do you get them up there? “I always preface this by saying, ‘I’m going to tell you something, and it’s going to sound really weird.’ ” Our waiter is back, to recite tonight’s specials. He waits for a pause in the conversation. What Garcia tells the patients is to douche with half-and-half once a month. The waiter maintains a neutral silence. “It seems to help.”