Next time, try turning it around, maybe it will result in a discussion, rather than a fight. Ask, "Ok, then, why are you selfish? Eating like you do is to cover up some kind of pain, just like my not eating is to protect me from my own fears. So, why are you hurting? And it's not just because you worry about me, because you were overweight before I came along. [I'm assuming this is true.] Tell me why you're suffering, too."