Cortisol is elevated during fasts and thyroid hormone lowered. Endotoxin absorption is increased by large meals. I would guess daily fasting might be a bad idea. It's perhaps like veganism, where after a period of years it could catch up to you in a bad way.

Of course it makes sense that people would be a bit sharper with elevated adrenaline and cortisol. But those fundamentally put stress on the body.