Not sure if this is helpful or not, but have seen a few references to physiological insulin resistance on other low carb forums which may explain some people’s higher blood sugars. It appears that this is actually a good thing, if the explanation I have copied below (lots of other references come up if you google it)is correct. It looks like you need to get your HbA1c tested to more reliably tell you if this low carb way of eating is benefiting you.
Physiological Insulin Resistance is better called “Adaptive Glucose Sparing”. Why would your peripheral tissues be primed and adpated to remove glucose from blood if… there isn’t any glucose in there to speak of?
No, those tissues adapt. Glucose transporters fold back inside the cell from the surface, instead the cell becomes more adept at taking in fat which is circulating. You literally become adapted to sparing glucose for use by those cells which absolutely require it. Some brain cells, red blood cells and testes require glucose because they do not have mitochondria!
Yes, FBG can easily rise above 100 mg/dl. But: FBG is a metric which is useful for day to day and hour to control and monitoring of blood glucose in diabetics. If you have physiological insulin resistance, you are literally at the opposite end of the risk spectrum to a diabetic:
•You will have an extremely low HbA1c value
•Your liver and kidneys will be very sensitive to the effect of insulin, even though muscle tissue isn’t
•You will almost never suffer hypoglycemic events
It takes a few days of eating carbs to return to the normal state for healthy people. This is why the term is “physiological” and not “pathological”. It is not a disease state, it is a healthy response to carbohydrate restriction.