My relatives in NC called it breakfast, dinner and supper. I call it breakfast, lunch and dinner.
I don't eat breakfast.
I eat lunch at noon, usually a salad. I always drink beet root juice at lunchtime to improve my oxygen level and energy for the gym. I sometimes find myself hungry again after working out, so I come home and eat leftover proteins (chicken, fish, etc.) that we didn't finish during previous dinners.
We eat dinner at either 5:30pm or 6:15pm, depending on when my partner gets home. It is a full meal (protein, starch, vegetables). I always have something hot and low calorie to snack on at about 9pm (Shrimp Paella, Bison Quinoa from Snap Kitchen). So, I'm essentially fasting for 14-15 hours.
I have found that recently my appetite has decreased, even though I'm more active than I was before I retired. I used to be ravenous by lunchtime when I was working. I could finish whatever meal was put in front of me in one sitting. Now I take half home. I think it's because of the salads at lunch and smaller portions for dinner.