Laser has hit a point here.

I specialize in prescribing Parenteral Nutrition in acute care settings, especially Critical Care. I’ve seen the negative effects of too much delivered carbs, yet extended ketosis past a week is also detrimental.

The healthy body is meant to cycle back and forth between carbs and fatty acids for fuel, but it isn’t a flip-switch. Both are still utilized while one dominates.

Laser has a fair point here. Man was meant to eat in sync with seasonal cycles, feasts and famines. I have eaten a lower to very low carb diet but have always done better with a periodic break and higher carb days.

I have aged, I do better with less extended (24-36hrs max) and less strict ketosis.

We are all individuals. Flex to what your body tells you. The key is attuned listening.