It's really a very narcissistic process. There is so much you will have to change as your surgery slowly moves towards a forever lifestyle. My wife was excited and terrified and it became the number one topic of conversation I wanted to know as much as possible, especially once I learned how many marriages tanked after weight loss. All of the talk of vitamins and protein and foods acceptable and not kind of boggles the mind. My advice is set aside certain periods of time where you do not talk about WLS, diets, food or exercise!
The way I dealt with it was to learn along side her and try to be helpful. I was very happy she was trying to take steps to deal directly with something that bothered her. It was going to mean changes in the way we both ate and lived.