David Ludwig, MD, PH D, author of the #1 New York Times bestseller ‘Always Hungry?’

Why do we get hungry, feel tired, and gain weight? A likely culprit is our fat cells. THE OBESOGEN EFFECT, written by the researcher who literally defined this new field, explains how our diet and other exposures can program the body for weight gain-beyond calories in, calories out-and what you can do about it!