After retiring early at 62 I found I don’t eat nearly as often as when I was working. Bowl of cereal in the morning and nothing until around 3pm, then either a small snack and dinner later or something bigger and just a bite later. Definitely no 3 meals a day routine. I didn’t have a physically strenuous job, just software development, but it seems like I needed to eat more. Stress maybe. Used to be when I got hungry I also felt slightly unsteady, like low blood sugar or something. But now if I get hungry I’m just hungry. I’ve learned that if I ignore it nothing bad happens - which almost feels like a superpower. I was never all that heavy but I’ve lost about 15 lbs and am stable within about 5 lbs of my high school weight, and I feel great.