Why Zebras Don't Get Ulcers

Preview

Here is the strange little miracle at the heart of this book. Stress is supposed to save your life. It is one of the great survival tools built into your body. If you are a zebra on the African savanna and a lion explodes out of the grass, your stress response is a masterpiece. Your heart pounds, your breathing deepens, sugar floods into your blood, and every system not needed for immediate survival goes quiet. Then, if you escape, the whole thing turns off. The crisis is over. You go back to grazing. We humans took that same elegant system and dragged it into a world of deadlines, grudges, traffic, loneliness, status games, bad memories, and imagined futures. We can sit perfectly still in a chair and trigger the same biochemical storm that evolution designed for sprinting away from teeth. We can do it over a mortgage, an insult, a quarterly report, or the fear that something awful might happen next month. That is the central joke and tragedy of modern life. We are smart enough to worry about almost anything, and our bodies often pay the price. That is the terrain Robert M. Sapolsky explores with wit, impatience, compassion, and a kind of delighted curiosity about how wonderfully odd we are. He wants to explain what stress is, what it does well, and what it does disastrously when it is turned on too often or for too long. He takes you from hormones and brain circuits to ulcers, blood pressure, aging, depression, memory problems, and the ways social life can either crush us or protect us. The argument is never that stress is bad in every form. Acute stress can sharpen you, energize you, and keep you alive. The real villain is chronic, unrelenting activation, especially when paired with...