It’s individual, again. I probably went off keto once per week on average for years, it was fine except if I go off, I easily go too far. The original post says about eating 2-3 times as much carbs… I am not that type. I had some way bigger multiplier in my life and I didn’t try to do it or planned anything like that, it just… Happened.
That’s another important thing to consider. Not everyone can raise their carbs just somewhat. I actually can, it doesn’t always happen when I try but it’s pretty doable and even normal for me these days, carnivore changed me and the food there is the best so not much temptation to stray much and often.
It may or may not be harmful to go off keto regularly. It’s impossible to say. Individual factors, what is what we eat when off (my body handles starch WAY better than sugar - and certain subpar processed items just ruin my day even in small amounts)… And there is a big difference between a carby meal and multiple similarly carby days. At least all my own experiences showed that, surely it’s not the case with everyone as many people can go off keto and staying there. If I go off, the more wildly I do it, the quicker I run back to carnivore
(But while the mind-altering carbs are in effect, I very easily eat more and more and more and more. I am evolved so I have some tiny control over it, it helps that I prefer non-carby food too but suddenly eating 100 times as much carbs as the previous day? Not a challenge, I don’t even need to try… It happens here and there anyway.)
And anyway, I can imagine less and less WHAT on Earth could I eat if not eggs, meat and my little dairy… Oh I have ideas, cute for a single course of a meal, in extreme cases it may become a whole meal but for the next meal I want my usual food. And my food is good! Nutritious and enough! I give my body what it wants, I can’t imagine why it would need something carby but if it will, it will tell me as I already wrote at some point.
But we evolved to handle lack of all carby items if needed. We do it pretty well, usually. We can get all our vital glucose from other things, we don’t need to eat carbs. And we don’t miss out on other nutrients… It would be so weird if some complicated stuff in us would still require carbs some people don’t even eat ever and still refuse to stop functioning correctly…