Did I already mess up my pre op diet

I forgot to bring my protein shake with me for my night meal so I grabbed a protein bar. I made sure that it was low in fat and did not have anything bad in it. I have my surgery next Wednesday. Should it be okay?

No you haven't I'm not a doctor but I think the earlier the better with the mess ups just try to stay on track pack your meals ahead of times and remember this is just the beginning you have some weeks to go on the liquid diet even after surgery good luck

should be ok but try to stay on plan and when you need to be on clear liquids you can not safely cheat

You should be okay, but this is really the time to work on getting good habits in place.  No more forgetting of protein shakes! :D