I am in a very similar position. I'm disabled due to a neurological condition, some days I can't really move much at all, pain, I'm stuck in bed & rely on DH to bring me food (or not). He usually CBA to cook, so I mostly get convenience food, takeaway, & general rubbish. Some days I'm ok, can move about, even exercise, I've recently increased the exercise, & feeling fitter already. When I'm well enough I try to batch cook for later but he won't eat any so it's just for me really. He always says it smells lovely, looks lovely, he tries it & compliments my cooking but just won't eat it - he prefers to eat crap.
Meanwhile he eats rubbish, loads of refined carbs, far too many sweets, takeaway at every opportunity, beer most nights, not enough vegetables, no exercise apart from walking to town for the groceries (which is a reasonable distance TBH).
I need to lose about 3st, he needs to lose about 5st. I'm really trying, he isn't, apart from a nod to "intermittent fasting", i.e. missing breakfast & lunch, then gorging himself at dinnertime & having couple of beers or glasses of whisky. If I try to discuss it he gets really defensive. I'm worried he's heading for a heart attack. He's 40, 6ft 4, & 20st.