Surgery is not without side effects. Please tell your friend to be careful. Surgery may lead to osteoporosis...
http://www.mercurynews.com/health/ci_12594487?nclick_check=1
Also, I believe a paleo diet will definitely lower blood sugars, as it has mine. It’s worth trying before taking the irreversible step of surgery.
She is aware of all the possible complications, and has not yet set a date, although she is thinking seriously about it.