I am just 2 weeks post op, I havnt been hungry for any food yet. I had a friend who "chewed" meat a couple of times right after surgery but spit it out. I cant imagine it would hurt you, I think it's best to just get a diet plan and stick with it. If you "mess up" learn from it and move on. Dont beat yourself up over it, just learn a lesson and let go.
Thats my 2 cents worth.