Generally, the stomach is the preferred place. The injected fat cells continue to live in their new location and act as a filler agent. The success of fat injections is tied to the injected cells continuing to live. If the injected cells die, then all of the filling effect will disappear after a few weeks. In short, dead fat cells break down as all living cells do when they die. Any lack of fat caused by any reason in the fat that covers the entire body creates an unwanted appearance in that area of the body. Fat injections / fat fillers / lipofilling can create a more pleasing appearance by filling in areas that have no or low amounts of fat.