My mother is perpetually either a) watching what she eats or b) espousing the doctrine of "Just thirty minutes of exercise a dayyyyy" which I have posted about before. Her latest tactic is letting everyone know that she's watching what she eats. I can't tell if that's for her benefit or if she's trying to be PA about it like she was when she repeatedly mentioned 30 minutes of exercise a day.
Well, my father and I were talking about where we wanted to go for dinner or if we wanted to cook. We'd eaten lunch at an Italian place and had all had pasta with some sort of cream sauce. Dad brought up the idea of eating Chinese, and my mother clutched at her stomach and said "No, not tonight, I just had pasta for lunch and that would be too rich for me to eat something like that twice in one day." To which Dad and I shrugged and started talking about somewhere else. My mother, unsolicited, interrupted with "I just have to eat something cleaner if I eat pasta for lunch, I may eat a piece of fish and some vegetables." To which my father suggested another restaurant and my mother said "Oh no, I couldn't go out twice in one day, they put so many sauces and preservatives and calories in things now" and which point my father said that was fine, we could stay home. He asked her if she wanted the leftovers in the fridge, at which point she heaved a martyred sigh and replied that no, those were far too rich for her tastes and she just wanted to eat cleanly for the rest of the evening, because she didn't usually splurge like she did at lunch. It was just so unusual for her to eat unhealthily like that but she did it every now and again, etc. etc. When Dad and I finished the leftovers she cooked her food and while we were eating turned to me and said "This is what I like to eat after I eat something rich and fatty for lunch, it's really good for you." I swear it never ends with her.
Your mother and my sister could be the same person.
When my sister and her poor long-suffering DH got together, and then were married, the poor man never got to pick what he wanted to eat or where to go. Dsis has a very specialized diet of choice, and is very particular on where and what she eats. Even at a restaurant, he had to share a meal with her, as she just didn't have a large appetite.
Finally, my BIL put his foot down and told DSis that he would order what he wanted, and she could do the same. Dsis has finally come closer to a normal relationship
with food and is tolerable to be around during mealtimes.