“Can you eat fast food after heart stent surgery?”

The recommendations for dietary modification start now, not tomorrow. Therefore you will have a better outcome if you eat a healthy diet. Fast food is processed food. Food should be in nature's own wrapper and protein can come from nuts, fish, and other sources besides animal fat. The most important thing is to get your cholesterol down to levels you were born with (LDL-C 20-40 to halt the progression of problems in your other arteries which you are at risk for). You don't go to Wendy's for green vegetables.