foods and beverages that you have to give up for good after surgery

I am hoping to have the RNY surgery but am in the process of getting it approved by OHIP which is the insurance in canada. I haven't found anything anywhere yet that lists out things that you have to be prepared you will never be able to eat again. For example after the surgery chips or chocolate would probably make you sick so you should avoid... I know that its standard for a diet anyway and that doesn't bother me. What about alcohol? IS this something that we will never be able to touch again? I dont' drink often but a glass of wine here and there is nice... If people could write and give me a list of things that I can expect to write off my list of foods/beverages for good it would be very much appreciated.

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