Thank you so much for your reply. Have you read Aubrey Gordon's work? Her profile is Yr Fat Friend here on Medium, though she also has a book out called What We Talk About When We Talk About Fat. I really learned a lot from her with regard to these issues and she might be relevant on the path you're walking right now, too. Being there for someone who is going through a really intense addiction is hard. I think there's a lot to be learned from the literature on harm reduction during the AIDs epidemic too that is relevant in an indirect way. How to Survive a Plague is a good one. But I'd definitely start with the Shira Hassan! It blew my mind.