Women have higher rates of obesity and eating disorders thanmen do, and now scientists think they know why. New studiesof brain scans show that different parts of men’s andwomen’s brains react to hunger, as well as to feeling full.
Angelo Del Parigi, of the National Institute of Diabetes andDigestive and Kidney Diseases, used PET scans to look at thebrains of 22 men and 22 women. A PET scan identifies areaswhere there are surges in blood flow that reflect brainactivity. Unlike X-rays, changes in the brain can beobserved on a PET scan while they are happening. Thescientists performed the scans after the participantsfinished a 36-hour fast and again after they drank a liquidmeal.