Is it safe to do ab crunches after eating?

I do it and I'm okay, so you should be fine. Unless I'm some kind of freak otherwise it's perfectly safe to do ab crunches after eating. Of course all those after eating ab crunches could some day come back to haunt me. I could become crippled and have to spend the rest of my life eating out of a tube. I could be in serious danger. The world as we know it could be over!!! Anyway the answer to your question is yes, it is fine to do ab crunches after eating.