Your husband is eating good, now. You should be eating this way too. Surgery is a way to avoid responsibility for what we put in our mouths. Don’t waste your time on the surgery, he’s digesting things perfectly. Spend your time reading up on low-carb and learning to eat that way as a lifestyle.
Think: Humans for thousands of years, or so, ate mostly meat, fish, vegetation, limited fruits, limited nuts. Consider what you eat today. Is it any wonder we have health problems galore?
Part of the "gathering" in "Hunter Gatherer" ~ your Ice Age lifestyle choice.