Ah, this is an issue we come back to time and time again (well every year or so I guess).
I'm vegetarian and as such my food is generally less expensive. My DH eats meat. No problem with that as such, but he hasn't cut down the amount of meat he eats, if anything he eats more now. Today he had bacon medallions with breakfast, a tin of tuna with lunch and plans to have an expensive individually wrapped chicken breast with dinner. These cost about £2.25 per breast and sometimes he has two.
His Pov: I can eat what I like.
My Pov: Yes, but... Food comes out of "joint money", and we are spending too much. I am trying to cut back like I bought the cheaper bread to save 60p. If I suddenly decided to eat meat (not going to happen) but we wouldn't be able to afford it. Basically he can only afford to eat meat the way he does because I have a much cheaper diet....
What is the answer? No kids btw