THE GOOD, THE BAD, AND THE NEUTRAL Not all fats are the same. Different fats work differently in our bodies. So, don’t just simply eat fats without knowing what are smart fats. Scientists place fats into categories on the basis of their chemical architecture, specifically, the presence of what chemicals call double bonds. FATS that have no double bonds are called “saturated” fats; FATS that have one double bond are called “monounsaturated” fats; and FATS that have more than one double bond ae “polyunsaturated” fats. Polyunsaturated fats are further divided into omega-6s and omega-3s.