Most of us have heard fat is bad for your heart.
But a doctor is testing how fat cells can protect you from having a heart attack.
Fat stem cells were taken from the patient's abdomen.
Doctor Marc Hedrick, President of stem cell company Cytori, says your abdomen is the most plentiful source of cells in your body.
Then he took the cells and using a 3D computer, injected the cells directly into the heart.
Over time they are supposed to grow better blood vessels and improve circulation.
Dr. Hedrick said, "The stem cells bring in new blood supply and new oxygen and make the heart work better."
One patient had this surgery done in Spain.
The patient is already home and is said to be doing well.
Only time will tell if the fat based stem cells really work.