Non-Fiction. This is not a light read or a summer read, but very interesting book about how the body ages and copes with the stresses of life. It makes you understand how stress affects our bodies from disease to aging on the inside and out. After reading this book, you may want to download a meditation App. The New York Times bestselling book coauthored by the Nobel Prize winner who discovered telomerase and telomeres' role in the aging process and the health psychologist who has done original research into how specific lifestyle and psychological habits can protect telomeres, slowing disease and improving life.