Cortisol: The Stress Hormone Double-Edged Sword: Optimal Ran: Optimal Ranges & What Affects Results
Learn about Cortisol: The Stress Hormone Double-Edged Sword and its role in longevity. Discover optimal ranges, how to improve your levels, and what the re
Key Takeaway
Cortisol follows a natural daily rhythm - highest in the morning to wake you, lowest at night for sleep. Chronic stress flattens this curve, leading to fatigue and sleep disruption.
What is Cortisol?
Cortisol is your body's primary stress hormone, produced by the adrenal glands. It's essential for:
Blood sugar regulation : Releases glucose from the liver
Blood pressure control : Maintains vascular tone
Immune modulation : Suppresses inflammation (acute)
Sleep-wake cycle : Cortisol awakens you; melatonin puts you to sleep
The Healthy Cortisol Curve
A healthy cortisol pattern follows a predictable rhythm:
6-8 AM : Peak levels (wake you up)
Noon : Approximately 50% of peak
4-6 PM : Lower, preparing for evening
10 PM - 2 AM : Lowest levels (allow deep sleep)
High cortisol : Anxiety, insomnia, belly fat storage, high blood pressure
Low cortisol : Fatigue (especially morning), difficulty handling stress, salt cravings
Flattened curve : Afternoon energy crashes, wired but tired at night
Cortisol and Other Biomarkers
High cortisol + high blood sugar : Stress-induced metabolic dysfunction
Low cortisol + low DHEA : Adrenal exhaustion pattern
High cortisol + [low melatonin] : Sleep-wake cycle disruption
FAQ
Is 'adrenal fatigue' a real diagnosis?
Can exercise lower cortisol?
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