When our younger son moved to California, it totally changed what we were eating, both in terms of what we ate and how much we fixed at a time. Some things we make more often, some things we do less often. We definitely do take-out a lot more often these days, too.
I'm afraid if I was alone I might eat macaroni and cheese every other day. Even something like tacos is a lot of work just for two people getting all the toppings ready, browning the meat, then putting everything away again. And a Texas Chocolate Sheet Cake would last a long time. (Fortunately, it freezes well.)
Smaller portions of foods are a lot more expensive per serving, too.