If there’s one hormone I could put on every high-achiever’s radar, it would be cortisol. It wakes you, sharpens your focus, fuels your movement, and helps you meet the demands of the day.. I know we're used to calling cortisol our stress hormone, but I want to change how you think about it.
If there’s one hormone I could put on every high-achiever’s radar, it would be cortisol. Cortisol is your activation hormone. It wakes you, sharpens your focus, fuels your movement, and helps you meet the demands of the day.. I know we're used to calling cortisol our stress hormone, but I want to change how you think about it. Less stress and more get-up-and-go. It responds to your energy needs. Without it, you wouldn’t just feel tired, you’d feel lost. But here’s the paradox. The same hormone that helps you conquer your goals can also quietly erode your health if it never gets the signal to stop. And in my clinic, that’s exactly what I’m seeing: cortisol curves that rise in the morning… and stay high all day. It’s the biological equivalent of driving with your foot on the accelerator, even when you’re parked. You don’t crash immediately. You adapt, until your body stops adapting. And then it shows up as:
Waking tired, sleeping wired.
Craving sugar and caffeine just to keep going.
Brain fog that arrives by mid-afternoon.
Weight that settles stubbornly around the middle.
And diagnoses with medication you don't want.
That’s why I measure cortisol levels so often. It’s one of my priority biomarkers, a gateway indicator for how you’re ageing, adapting, and recovering. Let’s dive in...
Where insight becomes impact
What I’ve been looking at this week…
I’ve been looking at the circadian rhythm of cortisol, and how losing it accelerates biological ageing. In a landmark longitudinal study from the University of California, researchers followed over 500 adults for six years, measuring cortisol at multiple points throughout the day. They found that those with flatter cortisol slopes, meaning their levels stayed high from morning to night, were:
47% more likely to develop inflammatory disease Twice as likely to experience sleep disruption
And aged 3–4 biological years faster than those with healthy rises and falls
Cortisol is designed to oscillate. A strong morning peak tells your body, “It’s time to move, think, and act.” A steady evening drop says, “It’s time to repair, digest, and restore.” When that rhythm flattens, the body loses its contrast, the on/off switch that keeps every other hormone, immune cell, and mitochondrion in sync. Chronically elevated cortisol also desensitises your cells, a phenomenon called glucocorticoid resistance. Inflammation rebounds, immune defences weaken, and the internal environment tips toward ageing. That’s the part that often surprises people: High cortisol can make you feel powerful...until it makes you fragile. And too little cortisol isn’t any better. When your adrenals can no longer keep up, your get-up-and- go becomes get-up-and-crash. The sweet spot? A sharp morning rise (your biological espresso), followed by a gentle evening decline (your biological sigh). That curve is your life rhythm.
Track it to hack it.
What I’ve been monitoring this week…
Here’s what I’ve been using and recommending to track and modulate cortisol:
1. 4-Point Saliva Cortisol Test My go-to. It maps your full daily cortisol curve — morning, midday, evening, bedtime. It shows whether your system is adapting (normal rhythm), overreacting (stuck high), or exhausted (stuck low). Plus I always do an add on test for my clients. It's called the CAR - Cortisol Awakening Response. Like switching on the ignition in your car. It specifically identifies your peak level of morning energy - a key marker that affects the rest of the day
2. HRV Devices (Oura, Whoop, Apollo) HRV - hear rate variability - is your recovery mirror. High HRV = flexible stress response. Low HRV = cortisol dominance.
3. Light Stimulators A white light box delivering around 10,000 lux mimics early morning sunlight - perfect if you can’t get outside. It raises cortisol naturally, helping you feel alert and aligned with your circadian rhythm. And remember, blue light isn’t the enemy; it’s all about timing. Use blue light early in the day to stay switched on, but block it in the evening to let cortisol fall and melatonin rise.
4. Vagal Tone Devices (Sensate, Apollo) These create micro-moments of calm that pull you back into parasympathetic mode, the state where cortisol learns to fall.
When you combine these, you control your cortisol curve.
From knowing to doing.
What this means for YOU…
If you often feel wired and tired, if you crash after caffeine, or if sleep feels unrefreshing no matter how long you’re in bed..your cortisol rhythm might be out of tune. Here’s how to start restoring it this week:
Get light right. Step outside within 60 minutes of waking, no sunglasses, no screens. This anchors your cortisol peak for the day and helps the evening drop arrive on time.
Time your coffee. Keep caffeine before 10 a.m. to support your natural cortisol curve. Drinking it later blurs the rhythm and delays recovery.
Pause your pace. Every 60 minutes, practise the 6-60 Breathflow: six breaths per minute for sixty seconds. It lowers cortisol in real time and trains your nervous system to oscillate again.
Reclaim your recovery window. Aim for screen-free time. Blue light keeps cortisol high and tricks your brain into thinking it’s daytime.
Test, don’t guess. Your cortisol curve tells a story your symptoms can’t. Pair it with your biological age test, and you’ll see how stress is shaping your cellular clock in real time.
💼 Case in point: One of my clients, a 42-year-old marketing executive, came to me feeling constantly “on.” She trained hard, ate well, and loved her job, but she was exhausted. WhenI tested her cortisol, her levels were three times the expected range, even at bedtime. We focused on restoring rhythm, not removing stress- morning light, caffeine cut-offs, and short vagal resets throughout the day using some carefully selected devices. Within 12 weeks, her cortisol curve normalised, sleep deepened, and her biological age dropped by 6 years.
You can’t fix what you can’t see...and cortisol testing makes the invisible visible.
Ready to find your rhythm? 🎯 If you'd like to make decisions with precision based on your personal data and using devices that are specific for you, then book a private consultation and let's start to decode your health. If you'd like to check your cortisol curve and book a biological age test, just press reply and I'll show you how to go from guessing to knowing...and from chaos to cadence.
Where you’ll find me…
Last week: Speaking at Pause Live - discussing the impact of hormone havoc on sleep through the menopause - there's a lot!
This week: Delighted to have been featured in the Daily Mail today on how to reverse ageing. Looking forward to my Million Hour Club G.R.O.W. Pod tomorrow morning - we meet online twice a month. Tomorrow it's an opportunity for members to grab a set on the coaching coach.
Next week: Looking forward to speaking in Lisbon.
A thought to pause on…
“Your cortisol curve is your body’s clock. When it keeps time, you keep youth.”
Learn when to rise and when to rest, and your hormones will follow your lead.
Do you know hat your cortisol curve looks like?
(I’ve seen too many people wait until they burn out to measure what’s been whispering for years. Don’t wait for exhaustion to force you to stop. Test your curve, read your rhythm, and get back in sync.)
Wishing you a wonderful week ahead! (that's 168 hours of your million hour life!) Dr Alka Be sure to send this email to anyone who you also want to live their longest, healthiest life!
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Take the free LQThis article is general education, not medical advice, and reading it does not create a doctor-patient relationship. If something has been going on for a while, please get it properly looked at by your own doctor.