I think our taste changes too.
I used to enjoy prepared foods that now seem full of sugar and salt. Campbells chicken noodle soup, canned chili, etc. If I eat it now, I need 2 glasses of water to wash it down and rehydrate.
I'm not as into chocolate either. A lot of sweets are simply too sweet. I noticed a 3rd helping of leftovers isn't appreciated by my system either. I can eat something twice but a 3rd time is a no-no.