This is the post I mentioned
@Brunneria. Do you have any more background on this please
@Oldvatr?
Ah yes, I think know to what
@Oldvatr is referring, although I have never heard that ketosis is recommended for only 8 weeks. (Is that a recommendation by a particular diet, Oldvatr?)
It is called physiological insulin resistance (PIR).
And it is complicated.
My basic understanding (and you are FAR better to google it yourself) is that it is a perfectly normal reaction by the body, to a period of kerosis (= ketosis - autocorrect!). It does not happen with ordinary low carb.
If we go into kerosine (actually ketosis - thanks autocorrect!) and stay there long term, our baseline blood glucose readings rise a little cause our bodies raise our insulin resistance a little in the process.
For me, this means that when I eat carbs I get a fbg in the 5s. In PIR it is in the 6s.
And my baseline blood glucose (the lowest numbers I ever get) rise from the 4s to the 5s.
I have not yet found anyone that can prove PIR is anything other than a normal thing. There is no evidence that it is harmful (and believe me, people have tried!) or beneficial (beyond the rabid paleo low carbers who treat ketosis as some Higher State of Being), although you get the usual uber cautious comments saying 'not yet proved safe'. But then, not yet proved harmful either! Lol
Personally, I like it. Yes, my insulin resistance is fractionally increased. But it acts like a nice protective buffer zone against hypos (I am prone to hypos). It is also a lovely clear indication that I am regularly in kerosis(!!!!). Yay! And it makes me feel good. Masses of energy. Better endurance.
As Oldvatr says, it is easy to avoid. Just eat a few more carbs for a day or two. The source I read suggested 150g a day for 3-4 days. We low carbers are recommended to do this before we do an OGTT to reacclimatise ourselves to carbs so we get an accurate result in the test, so it is no biggie.
Hope that helps