The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
Cortisol is often discussed as a stress hormone, but it's not just associated with stress. It also enhances your immune system provided cortisol is elevated at the right times, and the right time for cortisol to be elevated is when you first wake up in the morning.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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cortisol is essential for health and every day we get a rise in cortisol in the morning that is associated with enhanced immune function, enhanced alertness, enhanced ability to focus, so on and so forth.
And shortly after waking, your cortisol levels will start to reach their peak. And when I refer to a cortisol pulse, that's just biology nerd speak for a rise and peak in cortisol. You want that cortisol pulse to occur early in the day close to waking.
But cortisol itself is not bad. Cortisol is wonderful. Cortisol enhances the efficiency of the immune system. It makes us alert and focused. It stimulates our metabolism. It does a huge number of positive things, provided that it is released in a circadian fashion.