Stress: Friend AND Foe?

"The greatest weapon against stress is our ability to choose one thought over another." — William James

You've probably heard that stress is a silent killer, and that you should try to minimise it as much as possible – but that's only half right. Unfortunately, it's not as simple as all that. The problem isn't the amount of stress you have. Problems arise when you have too much of the wrong kind, and not enough of the right kind.

I know how counterintuitive that may sound, but bear with me. For years I treated stress the way most people do: as a one-dimensional problem to be solved through reduction or avoidance. I white-knuckled my way through demanding periods at work, told myself I'd feel better once things quietened down, and was surprised when I still felt worn out during the calmer stretches. What I was missing is that stress isn't inherently damaging. The dose, the duration, and your attitude towards it is what determines whether it builds you or breaks you.

Stress that Builds vs Stress that Breaks

The first thing to understand is that the word "stress" is an oversimplification. Fact is, there are two primary forms of stress.

Acute stress is short, sharp and often voluntary. You experience it when you push hard in a training session, take a cold shower, speak in public, or tackle a problem that sits just beyond your comfort zone. It triggers cortisol and adrenaline, raises heart rate and alertness, and then resolves. The body returns to baseline after demanding activity, and in doing so, comes back a little stronger and more resilient than before. This is called hormesis: the biological principle that a controlled, short-term stressor provokes an adaptive response. What doesn't kill you, in the right dose, genuinely does make you stronger.

Chronic stress is the opposite in almost every way. It is sustained, often involuntary, and rarely resolves cleanly. It is the background hum of financial pressure, a difficult relationship, a job that demands more than it returns, or a calendar that is always full of things not of your choosing. The cortisol keeps coming, the nervous system stays elevated, and the body never fully returns to baseline. Over time, this sustained cortisol exposure begins to erode the very systems it was designed to protect.

Research published in Neuroscience and Biobehavioral Reviews has documented the downstream consequences: chronic stress impairs memory consolidation, disrupts sleep architecture, elevates visceral fat storage, suppresses testosterone in men and disrupts oestrogen regulation in women, and, perhaps worst of all, increases systemic inflammation, a driver of chronic disease. Fact is, the body is not built to sustain a threat response indefinitely. When it tries to, the costs accumulate quietly and compound over years.

For anyone in midlife, managing a career, raising a family, running a household, and trying to maintain some version of a health regimen on the side, chronic stress is probably quite familiar to you. It's a normal Tuesday. What makes a difference for your health span is whether you are metabolising it or accumulating it.

Voluntary Stress: The Kind You Should Be Seeking

The most effective way to build stress resilience is to practise being stressed, on your own terms and in controlled doses.

Exercise is the most obvious example. A hard training session is, physiologically speaking, a significant stressor. It's guaranteed to spike cortisol, raise your heart rate, and place real demand on the musculoskeletal and cardiovascular systems. But because it is self-initiated and temporary, the body can adapt. Recovery follows, and with each cycle, the stress response becomes more efficient, and the baseline becomes more robust. A systematic review published in Frontiers in Psychology found that regular aerobic and resistance exercise significantly reduced perceived stress and lowered resting cortisol levels, with the effect being strongest in people over forty (the demographic whose stress response is most prone to dysregulation).

Cold exposure follows the same principle. Deliberate cold immersion, whether cold showers, outdoor swimming, or ice baths, activates the sympathetic nervous system acutely, triggering a surge in noradrenaline that research published in the European Journal of Applied Physiology has linked to improved mood regulation and enhanced stress tolerance over time. In simple terms, the mechanism matters. By practising calm under conditions of acute physiological stress, you become more and more accustomed to it.

The midlife reality here deserves acknowledgement. Not everyone has time for structured cold exposure or morning training sessions. Careers, children and the sheer administrative load of adult life are not flexible in the way that wellness content tends to assume.

The point is not to add another demanding task to an already busy week. Start with what you can control. A ten-minute walk in cold air. A thirty-second cold blast at the end of your shower. Getting in a workout, however short or imperfect. The benefit is not in the performance of the thing. It is in the repeated, deliberate act of choosing discomfort and then recovering from it.

Chronic Stress: What is it actually doing?

Most midlifers are carrying an almost imperceptible chronic stress. Between all the responsibilities and commitments, their bodies adapt to a new baseline of low-grade alertness, and the symptoms – disrupted sleep, elevated resting heart rate, persistent fatigue, brain fog, difficulty shifting body fat – all become normal and, worse, acceptable. In a subtle but sinister way, these symptoms are often regarded as the inevitable consequences of ageing. But this isn't the case.

In reality, these symptoms are the reversible consequences of unaddressed chronic stress.

For men, the compounding effects are particularly visible in midlife.

Research published in Psychoneuroendocrinology has documented the bidirectional relationship between chronic cortisol elevation and declining testosterone: high sustained cortisol suppresses the hypothalamic-pituitary-gonadal axis, reducing testosterone production at exactly the life stage when it is already naturally declining. Sadly, the result goes beyond reduced libido or lost muscle mass. It compounds as fatigue, increased visceral adiposity, and blunted motivation.

For women navigating perimenopause or menopause, chronic stress intersects with hormonal transition in ways that amplify both. Oestrogen plays a role in regulating the cortisol response; as it declines, the same stressors produce a stronger and longer-lasting stress reaction. Research published in Menopause: The Journal of the Menopause Society has found that perimenopausal women show heightened HPA axis reactivity, the stress response system, compared to premenopausal women, making stress management at this life stage not a luxury but a physiological priority.

Thankfully, these situations are not inevitabilities. With the right strategies, you can go from feeling wired and tired at the same time, to feeling recovered and in control.

The Discharge Valve: How to Metabolise Stress Rather Than Accumulate It

Put simply, stress that enters the body needs somewhere to go.

The problem with chronic stress, triggered by regular late night emails, financial anxiety, and near constant stimulation, is that it arrives without any physical resolution. Our ancestors faced stressors that had a physical component: the threat was real, the response was physical, and the discharge happened. We, on the other hand, have the luxury of cognitive and social threats, and so the overflowing cortisol has nowhere to go.

The discharge valve is physical activity, and it is the most well-evidenced intervention available. A meta-analysis published in JAMA Internal Medicine found that exercise is as effective as antidepressant medication for mild to moderate depression and stress-related mood disorders, with the additional benefits of improved cardiovascular health, body composition, and metabolic function. Even a twenty-minute brisk walk has been shown to meaningfully reduce cortisol and lower subjective stress ratings.

Breathwork is an even more accessible option, particularly when training isn't feasible. Slow, diaphragmatic breathing, specifically extending the exhale to be longer than the inhale, directly activates the parasympathetic nervous system and counteracts the elevated sympathetic tone of chronic stress. Research published in Frontiers in Human Neuroscience demonstrated that as few as five minutes of controlled slow breathing produced measurable reductions in cortisol and subjective anxiety. The physiological sigh, a double inhale through the nose followed by a long exhale through the mouth, is the fastest-acting single breath pattern for acute stress reduction, according to research from Stanford's Department of Psychiatry and Behavioural Sciences.

For midlife adults specifically, both of these interventions are scalable to real life. You do not need a gym, huge amounts of time, or ideal conditions. You need a walk, a few minutes of controlled breathing, or a few cold minutes at the end of a shower. Done consistently, the cumulative effect is substantial. Of course, if you can do more, then do so. My point is that even these seemingly simple habits can be immensely helpful.

Recovery: Not a Reward, but a Requirement

The final and most culturally misunderstood piece is recovery. We live in a culture that frames rest as something you earn, as something that signals you are not working hard enough, or worse, good enough. There's a lot wrong with this framing, but arguably its worst flaw is that it has human physiology backwards.

Stress, whether voluntary or involuntary, is only adaptive if recovery follows. Without the recovery phase, acute stress simply accumulates and begins to resemble chronic stress. The training session that builds resilience is only doing so because the sleep, rest, and nutritional support that follow allow the adaptation to occur. Remove the recovery, and any stimulus can become damaging over time.

This is where midlife adults are most vulnerable, and most likely to cut corners. Sleep gets sacrificed. Rest feels indulgent. Downtime feels unproductive. But research published in Current Opinion in Psychology has been unambiguous: cognitive and physiological recovery, real recovery, not passive screen time, is the mechanism through which stress becomes adaptive rather than degenerative. Without it, the well-intentioned commitment to hard work and high output simply accelerates the erosion.

You do not need to radically restructure your life to recover better. You need to stop treating recovery as optional. That means protecting sleep as a non-negotiable (see the previous edition of this newsletter). It means building transitions into your day, time without screens, a walk at lunch, a deliberate break between work and family life, a few minutes of stillness before the next demand arrives.

Long Story Short

Stress is not your enemy. Chronic, unresolved stress is.

Here is where to start:

• Seek voluntary stress deliberately: exercise hard, embrace controlled discomfort, practise doing difficult things on your own terms

• Recognise the signs of chronic stress load: disrupted sleep, persistent fatigue, stubborn body fat, brain fog, low mood

• Use physical activity as your primary discharge valve: even a twenty-minute brisk walk meaningfully reduces cortisol

• Learn one breathwork technique and use it: slow exhale-extended breathing or the physiological sigh

• Rest like your life depends on it (because it does): rest is not a reward, it is the most crucial ingredient

At the end of the day, we cannot eliminate stress. We weren't designed to. But we can learn to metabolise it, and when we do, it stops being something that happens to us, and starts being something that makes us look, feel and live better.