Oh, this is new to me. If that is true, then that would still require balancing, since saturated fats come with other problems themselves. I suppose there’s no “clean” way to do anything at any rate, so it takes personal testing and monitoring. But I am fully willing to accept my recommendations might be outdated or misguided, and what you say is correct. It has been a while since I was on an overseen keto diet and things do change in time with new research and guidelines. To that end, I’d recommend checking out if that is indeed true, and if the new recommendations/consensus would make my point moot.
Either way, the fiber was a strong point when I was taught the diet by my doctor and a dietitian, and I can’t see that having changed. As far as I’m aware, fiber is a critical component of our gut health but also immune system robustness. And done right, it does nothing to affect the energy sourcing or glucose levels or whatever. I was given the rough guide of overall carbs - fibers = “final” carbs ingested. Not really sure how to translate that into English but I think it’s a common rule of thumb and you get the gist. Has that changed since?
But I’ll end on this note: Whatever I or someone say here on internet, best to double-check it all with your dietitian if doing an overseen diet, and yourself from internet if you’re doing it on your own.
Nutrition and health are no small things to play with. Our body is flexible and can survive a whole lot, in a lot of different situations, but there are prerequisites for it to thrive in a sustainable way. And there’s a fundamental distinction between just surviving/existing and thriving/being healthy.