If you crave foods you know aren’t good for you, the reason may be all in your head. Emory Healthy Aging Study team member Sharon Bergquist, MD serves as an expert for Fox 5 News Atlanta, teaching viewers ways to change their bad eating habits.  Studies show that eating salty, sugary, high-fat foods stimulate the reward center in our brains, triggering a rush of the “feel-good chemical” dopamine.