David Sinclair, a Harvard genetics professor who only sleeps 6 hours a night and doesn’t exercise every day swears 3 habits helped reverse his biological age by a decade. Excellent article that is well worth the read...I believe that I would add daily exercise (your choice) because muscle is the organ of longevity...and I feel the older he gets he would want to add this to his regimen...otherwise I concur from experience his foundational practices.
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Which is my understanding that stress hormones are used to convert fat into ketones. Long term keto is bad news.
You can have high cortisol in any diet, it's caused more by environmental factors and stress in general and leads to issues like poor sleep which in turn causes the body to store more fat instead of burning it. People with high cortisol levels tend to have higher percentages of visceral fat which it itself causes more inflammation and you're on the road to diabetes and heart disease and such.
We don't know the full effects of long-term (multiple years) keto which is why it's something meant to be done in phases not become a permanent lifestyle. The goal really should be to develop metabolic flexibility so that you can switch between carbs and keto diets seamlessly (what's referred to as fat adaptation.)
Metabolic flexibility is crucial. It is true though that cortisol and adrenaline elevate in the absence of glucose.
Also, there is probably a reason mainstream media is shoving keto down our throats.
And fasting, IFM is the Current Thing.