Is he having other issues along with the
odor problem? Or is this something that started before the gallbladder
removal? In some cases, changes in bacterial count or type could cause an issue, and if that's what's happening the use of some probiotics might be helpful. Lactose could be an issue, and if he used lactose-free products it would be helpful. But if he has problems with diary that continue with the use of something like lactaid, it could be more than just a lactose issue.