By Dr. Kathryn Dundas, MD, CCFP
Sublime Life | The Journal
There’s a moment I see again and again — in clinic, in conversation, and honestly, in myself.
It’s the moment when everything is technically fine…
but your body is quietly asking for less.
Less output.
Less optimization.
Less pushing through.
And yet, we keep going.
What’s often happening beneath the surface isn’t burnout — it’s cortisol drift.
Not a dramatic spike.
Just a steady, low-grade elevation that slowly reshapes how the body functions.
Cortisol: the master signal
Cortisol is not the villain it’s often made out to be.
It’s essential for:
- Waking up in the morning
- Mobilizing energy
- Regulating blood sugar
- Modulating immune response
The problem isn’t cortisol itself — it’s duration without recovery.
When cortisol remains elevated over time, it begins to shift multiple systems at once. Prolonged elevations in cortisol have been shown to alter immune signaling, impair metabolic regulation, disrupt sleep architecture, and affect cognitive flexibility — even in individuals who appear outwardly functional (McEwen, 1998; Sapolsky, 2004).
This is why stress rarely shows up in just one place.
It shows up everywhere.
Where the HPA axis fits in:
Behind cortisol is the HPA axis — the communication loop between the hypothalamus, pituitary, and adrenal glands.
Think of it as the body’s internal feedback system for safety and threat.
When stress is short-lived, the system turns on and then turns off.
But under chronic pressure — emotional, cognitive, physical, or even “productive” stress — the off-switch becomes less responsive.
The result isn’t exhaustion at first.
It’s adaptation.
You keep functioning.
Until one day, you don’t.
Longevity medicine isn’t about how much stress you can tolerate — it’s about how efficiently your nervous system can return to baseline. Research in stress physiology consistently demonstrates that the ability to return to baseline after stress — rather than stress exposure itself — is a key determinant of long-term health and disease risk (McEwen & Wingfield, 2003).
“Longevity isn’t about how much stress you can tolerate — it’s about how quickly your nervous system can return to safety.”
Rest is a biological intervention
Rest isn’t passive.
It’s not collapse.
And it’s not “doing nothing.”
Rest is an active signal of safety to the nervous system — and safety is what allows cortisol to normalize.
When that signal is received:
- Heart rate variability improves
- Inflammation markers quiet
- Hormonal rhythms re-align
- Immune resilience strengthens
- Mental clarity returns
This is why presence is not poetic language.
It’s physiology.
The recalibration most people skip
Often, the most effective intervention isn’t another supplement or protocol.
It’s:
- Eating without multitasking
- Slowing the breath before sleep
- Sitting outside without stimulation
- Allowing one thing to remain unfinished
Not because you’re falling behind —
but because you’re recalibrating the system that runs everything else.
This is the art of not pushing.
And paradoxically, it’s often what allows the body to move forward again — stronger, clearer, and more resilient than before.
A better question to ask this week
Instead of “What else should I be doing?”
Try asking:
“What would help my nervous system feel safer today?”
That answer is usually simple.
And it’s almost always enough.
Practitioner Pick
Equine-Assisted Experiential Sessions with Dr. Dundas
Non-verbal connection, rhythm, and co-regulation — powerful inputs for recalibrating the stress response.
Treatment Pick
Float Therapy
Deep parasympathetic activation with measurable reductions in cortisol and improved sleep quality.
Make presence your protocol.
— Dr. Kathryn Dundas, MD, CCFP