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.

In this day and age, many aren’t as active. Marketed foods are often stuffed with carbs. A toggle toward more ketosis to offset the energy intake imbalances can benefit most, but it’s not right for all, all the time.