[cmrdporcupine]

If you go keto/atkins/etc for a while you get sick of meat. At least I have. It becomes tedious to eat and my portion sizes have dropped. I end up eating more vegetables than I ever did before, and take more pleasure from them.

[tallanvor]

There's certainly some combination of psychology and physiology at play here. There are many nutrients we need that we can't get without a suitably diverse diet, so we're hardwired to seek out variety. Even people who are starving or constantly on the edge will get tired of having a diet that doesn't include much variety.

My father loves to talk about how he can eat the same thing every day, but whenever I visit, he's very quick to suggest going out to eat. He obviously gets tired of eating the same thing over and over, but he doesn't want to deviate too much from his routine since it helps keep him from regaining weight.

I know I'm starting to crave a steak - it's been a few weeks, and normally I would have steak and potatoes on Sundays as a treat after an extra-long workout.