We’ve all heard that stress is harmful. But what the neuroscience of stress now reveals is far more urgent and far more actionable.
Chronic stress isn't just unpleasant. It's wreaking havoc on our biology. Heart disease, cancer, stroke, depression, immune problems: stress feeds into all of it. It literally rewires our brains and ages us at the cellular level. And here's the kicker: it's not getting better. Global stress levels are still climbing, even years after the pandemic started.
A recent Nature feature called "Stress is wrecking your health: how can science help?" lays out exactly what stress does to our bodies and why we need to completely rethink how we deal with it. As someone who teaches coaches how to use neuroscience in their work, I think this should be required reading - not just for doctors, but for anyone trying to help people change.
Because here’s the uncomfortable truth: Most of what we call coaching is happening in the presence of unresolved stress. And if we can’t spot it, undertand it, or work with it, we’re missing the very foundation of transformation.
Stress Hits Your Entire Body, Not Just Your Mind
Stress isn't a feeling you can think your way out of. It's a full-body takeover.
The Nature piece shows how stress affects nearly every system we've got: heart, immune system, breathing, digestion, hormones, even our sleep cycles. When your brain senses danger, it flips the body into high alert. Cortisol shoots up. Your heart pounds. Blood sugar spikes. Muscles clench. Blood gets redirected. Your body is ready to fight or run.
This fight-or-flight response works great in short bursts. But our stress system evolved for survival, not for dealing with overflowing inboxes, traffic jams, money worries, relationship drama, or burnout. This is also where the neuroscience of stress in coaching becomes essential. When we understand how stress shifts brain–body function, we can see why so many coaching strategies fall flat under pressure.
Psychologist Wendy Berry Mendes explains it perfectly in the article: stress becomes toxic when the "on-off" switch breaks. When your body anticipates stress too early, holds onto it too long, or stays activated even after the threat is gone, that's when stress shifts from helpful to harmful.
This is crucial for coaches to get. If your client is dysregulated (even slightly) their brain's ability to reflect, plan, and change gets compromised. You might be asking brilliant questions, but their system isn't ready to answer them.
Most Stress Flies Under the Radar, But It Leaves Traces
One of the biggest insights from the Nature article: stress gets missed in medical care because nobody's really looking for it. Most doctors don't ask about it. And when they do, they're relying on what patients say or quick vital signs checks.
But stress isn't static. It changes throughout the day, week, and depending on what's happening. To measure it properly, you need to look at patterns, not just snapshots.
Researchers like George Slavich are developing better ways to assess stress. They're looking at biological markers like cortisol rhythms, heart rate variability, inflammation levels, and even changes in gene expression after social stress. One study mentioned in the article found that a ten-minute stressor can affect more than 1,500 genes.
A ten-minute stressor can affect more than 1,500 genes.
This is where stress science is headed: personalized, biological, and tracked over time.
Coaches don't need to run blood tests or track gene expression. But we do need to sharpen our observation skills. Subtle changes in breathing, voice, posture, or pacing often tell us more about stress than words ever will.
In my work, I teach that we're mind-body systems. If we only coach thoughts, we miss the regulation state the brain is operating from. Insight, motivation, and clarity emerge from a regulated system (you can't force them when someone's dysregulated).
Stress Is Personal: One Size Doesn't Fit All
People respond to stress differently. The article points out important differences: men and women react differently to different types of stress. Someone's history (especially early trauma) shapes how sensitive their stress response is. So does gut health. So do genetics. So does what gives their life meaning.
This makes one-size-fits-all stress strategies ineffective. And it also challenges the coaching industry’s reliance on mindset work alone.
Slavich and his team are now testing stress "profiling" to guide personalized interventions. Their program matches people with targeted 12-week plans focused on sleep, movement, nutrition, thought patterns, or social support (depending on their unique stress signature).
This matches what many coaches see: what helps one client regulate might overwhelm another. Some clients thrive with structure and routine. Others need play or rest. Some benefit from reframing their thoughts. Others need their stress acknowledged before they can access a different perspective.
The deeper insight: Stress isn't a problem to fix. It's a system to understand. Until we do, we'll keep offering solutions that don't stick.
Stress Reshapes the Body from the Inside Out
One of the most compelling insights in the Nature article is that stress doesn’t just impact mood or behaviour. It leaves a biological signature, right down to your cells.
New research shows that mitochondria (the powerhouses of our cells) are incredibly sensitive to stress. Chronic psychological strain can damage mitochondrial function, reducing the energy available for recovery, focus, and physical health. As stress builds, energy depletes. As energy depletes, stress escalates. This isn't metaphorical (it's metabolic).
This mitochondrial perspective is one of the most interesting shifts in how we understand the long-term effects of stress. It explains why some people burn out even when they're doing everything "right." It's not about willpower. It's about an energy system under pressure.
It’s not a lack of willpower. It’s an energy system under pressure.
Researcher Martin Picard describes this as a vicious cycle: stress drains your cellular energy reserves, and reduced energy makes it harder to regulate stress. This loop doesn't just affect the brain. It shows up in visible ways. Hair can actually grey under stress, then return to its original color once the stress resolves.
This changes how we think about recovery. It's not optional or indulgent. It's necessary for maintaining the biological capacity for change. When I work with coaches and leaders, I hammer this point: resilience isn't about pushing through. It's about restoring what the system needs to re-engage.
The Gut-Brain Highway and Your Vagus Nerve
The article also highlights the connection between chronic stress and the microbiome (the ecosystem of bacteria in the gut). Stress can shift the balance of that microbiome, and a disrupted microbiome can, in turn, heighten the stress response. It’s a feedback loop that works in both directions.
In coaching, we often focus on narrative and insight. But if a client’s gut–brain axis is imbalanced, their capacity for clear thinking and emotional regulation may be affected in ways they can’t control cognitively. This reinforces why we need to take the whole system seriously (not just thoughts and goals, but the internal state that makes those things possible).
The vagus nerve plays a central role here. It’s the primary communication pathway between the brain and the body. Direct stimulation of the vagus, through breathwork, humming, cold exposure, or certain movements, can help modulate stress. These aren't fringe practices. They're scientifically backed ways of influencing how the nervous system responds to threat and recovery.
You don’t need to be a somatic therapist to integrate this into coaching. What matters is recognizing when a client’s body needs something different than their mind is asking for. Slowing down. Grounding. Resourcing. Returning to breath. These small shifts can restore access to choice and presence, the very conditions required for insight to actually land.
What This Means for Your Coaching Practice
This isn't just interesting science. It's a challenge to how we coach.
What the Nature article makes clear (and what I see in practice is that we need a new level of fluency in stress. Not just to support well-being, but to make change possible.
Here’s what that looks like in action:
Final Reflection: Stress Literacy Isn’t Optional Anymore
The Nature article ends with a simple but powerful reminder: we don't need to eliminate stress. Some stress (when it's regulated and makes sense) is essential for motivation, meaning, and action.
But we do need to recognize the cost of chronic, unresolved stress. We need to be able to see it, name it, and work with it, not only for our own health, but for our clients' growth.
Through the lens of the neuroscience of stress, In coaching this means understanding:
You don’t need to be a neuroscientist to bring this into your practice. But you do need to know what stress looks like. You need to recognize when your client's nervous system is online, and when it's gone into protection mode. You need to know when to ask powerful questions and when to stop talking and help someone settle.
Because the real work doesn't happen in the change plan itself. It happens in the nervous system, in whether the client has the internal capacity to engage with that plan, act on it, and integrate real change.
Reference:
Peeples, L. (2025). Stress is wrecking your health: how can science help? Nature, 643(8071), 318–320. https://doi.org/10.1038/d41586-025-02066-z
Picard, M. (2025). Mitochondria Are More Than Powerhouses - They’re the Motherboard of the Cell. Scientific American. https://www.scientificamerican.com/article/why-mitochondria-are-more-like-a-motherboard-than-the-powerhouse-of-the-cell/