This thread is ringing an awful lot of bells.
My other three-quarters, bless her, seems to think that I'm currently starving myself to death and keeps suggesting that I 'should eat' (I have 3 decent meals per day, BTW, and have never snacked between meals). When I do eat, she often looks at the portion size I've dished out for myself and suggests: 'Surely that's not enough?'.
Mother-in-law is pretty much the same. She's an absolute diamond but she's told my wife that she's worried I'm not eating 'properly' and has bought me a premium Xmas Pudding for when she comes over to stay, the week after next. That was after the roast dinner she made for us when we went to see her 3 weeks ago, with a special (v. sweet) cheesecake for afters.
I didn't want to disappoint her so I ate some, but paid for it over the next day or two.
I've tried to explain to people that left to my own devices I'm fine, but some don't seem to want to accept that, particularly the older generation, who were brought up with a different notion of what 'eating really well' meant.
I'll get through this first Xmas as a T2, I'm sure, but it's already feeling like it's going to be a bit of a struggle.