100 Simple Secrets of Healthy People: What Scientists Have Learned and How You Can Use ItThe Simple Science of a Healthy Life From fitness to diets to emotional health and longevity, what do people who feel and look healthy do differently than those who are overtired, depressed, or out of shape? Every day we face an avalanche of studies and statistics that tell us what we should or shouldn't eat, how long we need to exercise, or how to protect ourselves from secondhand smoke and the harmful rays from the sun. Not only are these studies