A few years ago, Marta Zaraska's mother decided to go vegetarian after stumbling upon an article on the health risks of eating meat. Her resolve lasted about a fortnight before the juicy hams and the creamy pâtés began creeping back into her refrigerator. Prodded to explain her lapse, she replied, I like meat, I eat it, end of story."
Many of us have had a similar experience. What makes us crave animal protein, and what makes it so hard to give up? And if all the studies are correct, and consuming meat is truly unhealthy for us, why didn't evolution turn us all into vegetarians in the first place?

In Meathooked, Zaraska explores what she calls the meat puzzle": our love of meat, despite its harmful effects. Scientific journals overflow with reports of red meat raising the risk of certain cancers; each hamburger contributes as much to global warming as does driving a car 320 miles; and the horrors of industrial meat production are now...