There is no way to predict how any individual will respond to quitting alcohol.
Your friend, indeed shows withdrawal symptoms.
Loss of appetite is one of the withdrawal symptoms.
Your friend has to see a physician as soon as possible.
Alcohol in patient with gastric bypass causes more adverse effects, even serious ones.
The anatomical changes in the GI tract and reduced calorie intake that occurs after surgery, both, influence alcohol absorption in gastric bypass patients.
Their alcohol absorption is far higher and it takes less time and amount to rich high blood alcohol concentrations.
I guess she has developed thiamine, vit B1 deficiency (which can be fatal).
Alcohol use, also, has affected her metabolism, and her brain and nerves have been depleted of the fuel needed to function.

She must be treated for the adverse effects of alcohol, and after that for her addiction (is very common, food addiction to be switched with alcohol addiction)

Best wishes!
Marija

I to had gastric bypass, and turned to alcohol and being hospitalized for 2 weeks. I fed every emotion I had, now which has turned to a liquid food called ALCOHOL!! I lost my marriage two weeks ago along with my life... This deadly life threatening and weight loss surgery truely needs to be discussed more in depth with others who are thinking about TAKING ON THIS SURGERY!! or as I call it a BEAST cdj

My wife had bypass surgery and around 4 years post she started to drink beer and has not been able to quit. She drinks 12 a day and no longer has a life. She has been to detox 3 times and has met people in detox who had the surgery and 3 to 5 years later are consumed by alcohol.This nightmare has been going on for almost 3 years. She is a very stron person yet helpless to the cravings. This seems to be an area that really needs to be addressed prior to surgery as well as help after words. She would never have gotten the surgery even as desperate as she was if she new this would her life now!Does anyone have any advice or feedback on this?

I also had the surgery it will be 3 years ago in Feb. I have struggled with drug addiction and alcoholism every since. In my opinion this surgery totally screwed up my life and made me into a different person. I do not recognize myself anymore. I am saddened by the chaos my life has been in since this all started. I have lost several relationships and gained several that are seriously unhealthy for me. I have lost my 8 year old daughter to her Dad whom I left a year ago. I would advise anybody thinking about this surgery to get professional counseling not only before but after as well.