I tried it consistently, carnivore style, for a couple of years. I'd eat a pound or more of ribeye steak seasoned only with salt around 2pm. On the weekends, if I got the munchies after that, I'd add some cheese, bacon, etc.
It worked great for me, for a while. It was nice not having to think about preparing food, eating, clean up, etc. more than once per day. I got lean very easily, had lots of energy all day long, lifting was great, no hunger, no cravings, etc.
One year after my annual physical, the doctor noticed my fasting blood glucose was above 100, which is very strange since I wasn't eating carbs. He made some recommendations that ended up not working for me at all.
After looking at the medical literature myself, turns out some studies have shown that skipping breakfast and/or eating one meal a day can raise cortisol levels in some people. Cortisol stimulates gluconeogenesis which raises blood sugar levels, even in people not eating any carbs at all.
So I started eating a steak first thing in the morning, another steak for lunch, and some eggs and cheese for an early afternoon dinner. My blood glucose levels dropped like a rock and have remained normal consistently since then.
I'm still fasting from early afternoon until breakfast the next morning, but I no longer have issues with elevated cortisol or glucose.
