Lots of folks rightly pointing out that your body is not a six-pack and so on and not a lot of folks remembering that actually what your boyfriend's parents are proposing wouldn't be right even if we were talking about alcoholism. When someone is in recovery from alcoholism, of course you don't proactively offer them a beer, but it's not appropriate or reasonable or healthy for them to demand all alcohol be removed from their presence. One of the fundamental skills of addiction recovery (whether it's overeating, alcoholism, or disordered sexuality) is getting used to other people having the thing near you. I don't think anyone can reasonably argue that he's "in recovery" if he's not cognizant of it being his responsibility to acquire that skill.