I've hesitated to post this because I know how any thread to do with weight and eating usually goes on MN, but I hope people will be kind in view of the MH dimension.
So I've had issues with bulimia and binge eating for most of my adult life. My DM doesn't know about this (she's not very well-versed in MH issues) and I think she just thinks I'm a bit fat because I'm greedy and have no willpower. I have fluctuated between being a normal weight (BMI of 21) and being bordering on obese (BMI of 29) and am currently somewhat overweight but not the heaviest I've ever been.
DM does not understand MH issues at all, and would not accept that I have an ED, because I've never been underweight. Oddly enough, I'm pretty sure she has suffered with some sort of orthorexia (at the very least) herself, as for years she ate the same meals every day, wouldn't eat anything with sugar in it even as a once-in-a-blue-moon treat, wouldn't eat in front of anyone else etc. She would always just say that this was what she had to do to keep her figure, and it's not a problem, it's just that she has decent self-discipline. She's not quite as bad as she used to be , but I don't see her every day so I don't know what she eats at home.
My issue is that she has always done this sort of "competitive undereating" thing around me, but that as I get older and more able to see what she's up to, I'm getting less and less inclined to tolerate it. To give an example of what I mean, if we meet up somewhere nice for lunch, she'll start off by saying something like "Oh, I'm not really very hungry, I had a slice of toast for breakfast and I'm still so full." She'll then just get a tiny starter and nothing else, and I'll feel self-conscious just for eating a normal-sized lunch. She never eats a full portion of anything and always claims not to be hungry. She's always leaving half-servings of things in the fridge which she never gets around to finishing. During one of my slimmer phases, DM told me she looked down on fat people because they couldn't control themselves like she can, and she's always making comments about so-and-so who's put weight on, and making unkind comments about people she sees in the street who are overweight.
I think she actually has a serious problem, but her problem is making my problem worse, and I don't have the headspace to deal with her as well as myself. To someone with robust self-esteem and no issues with food, it would be easy to just think she was a bit pathetic and not pay any attention to her attempts to make me feel shit, but I always come away from any encounter involving DM and food feeling like a disgusting fat whale, and I usually have some kind of relapse soon afterwards.
I know people might ask why I can't just go NC. It's difficult to explain without going into a whole load of other issues, and this is already too long, but suffice to say it's not really an option atm. How would people deal with a DM who is like this and who isn't open to speaking about MH issues? I should say that she's extremely defensive if anyone suggests she is at fault in any way, and it always ends up with her being the victim. Help?!