We have over 200 different cell types with the same exact DNA, but that look and function totally differently. Think heart cell versus brain cell. This biological feat is accomplished through epigenetics – molecular marks on our DNA that tell our genes when to turn on and off. These marks can be altered by everything from the food we eat to the stress we experience. We talked with Dr. Dana Dolinoy of the University of Michigan to discuss the exciting and emerging world of epigenetics.