My AH had problems with diarrhea daily while he was drinking. Once he started drinking food became un-important.
He has been sober now about 80 days. while he was in treatment they talked to him about about eating a balanced diet.
He is eating now more than I have ever seen him eat. Never liked sweets before but has ice cream every night, loves cookies, candy etc.
He still has some diarrhea but overall it has gotten much better since he quit drinking.
I have heard many people bring this up so it seems to be related but I wouldn't take chances - I would check with the doctor.