Your tiredness is not a cortisol problem. It is a workload problem.

Tiredness is not a symptom until somebody has a use for it. On its own it is the body's ordinary accounting: you were awake for sixteen hours, you did things, some of them were hard, and now the machinery would like to stop. That is not a deficiency. It is the design working. What the last decade of wellness commerce has managed, with real ingenuity, is to take that unremarkable fact and reclassify it — as adrenal fatigue, as burnout at a stage you can chart, as a magnesium problem, as a cortisol curve that has gone off-piste, as something a ring on your finger can score out of a hundred while you sleep. Once tiredness has a name and a number, it has a market.

I want to be careful here, because the argument I am making is narrower than the one people expect. I am not saying fatigue is never a medical matter. It plainly is. Persistent, disproportionate tiredness that does not lift with rest is one of the most useful signals in general practice, and it is the front door to diagnoses that matter enormously — thyroid disease, anaemia, sleep apnoea, diabetes, depression, cancer, the long tail of post-viral illness that medicine is still, honestly, working out. Anyone whose tiredness has changed in character, or arrived without a cause, or brought other things with it, should be investigated properly and should keep pushing if the first answer is a shrug. Nothing in this piece is an argument against that.

My argument is about the other kind. The tiredness that has a cause, and the cause is your life.

What is actually being sold?

The wellness version of depletion has a particular shape, and once you can see the shape you can see it everywhere. It takes a state, gives it a mechanism that sounds physiological, and attaches the mechanism to a purchasable intervention. The mechanism is the load-bearing part. It does not have to be correct; it has to be legible. Cortisol is perfect for this because most people know it is real, know it is about stress, and do not know what a normal daily cortisol pattern looks like or how badly it would need to deviate before anyone would treat it. Into that gap goes an adaptogen, a powder, a protocol, a panel of tests you order yourself.

Adrenal fatigue is the clearest case, and worth being precise about, because the precision is the point. The concept — that chronic stress exhausts the adrenal glands until they underproduce — is not recognised as a diagnosis by endocrinology, and reviews of the evidence have not found a consistent biochemical picture behind it. Adrenal insufficiency, meanwhile, is a real and serious condition with real tests and real treatment. The wellness industry borrowed the vocabulary of the second to sell supplements for the first. That is not a fringe operation. It is a functioning retail category with its own influencers, its own testing labs and its own follow-on purchases.

Wearables do something subtler and, I think, more consequential. They do not invent a condition. They produce a number where there was previously a feeling, and numbers invite management. A readiness score is a genuinely interesting piece of consumer engineering and it is also, functionally, a device that converts the question "am I tired?" — which you can answer — into the question "am I recovered?" — which you cannot, and which now requires the device. I know women who have stopped trusting their own assessment of how they slept because the app disagreed. That is a strange transfer of authority to have made without deciding to make it.

What is lost when rest becomes a protocol?

Three things, and the third is the one that actually annoys me.

The first is money, which is straightforward. Supplements, panels, subscriptions, the second supplement that addresses what the first one apparently disrupted. People who are tired are not at their most sceptical, which is part of why they are a good market.

The second is diagnostic delay. If your fatigue is being handled as a lifestyle optimisation problem, and the framework you are using explains every result — better means the protocol worked, worse means you need more of it — then there is no point at which the framework tells you to go and get your bloods done. A belief system that cannot fail cannot refer you on.

The third is that the protocol makes rest into another thing you can do wrong. Rest, in its ordinary form, is unproductive by definition. It is lying down in the afternoon. It is the evening in which nothing is achieved. Wellness culture cannot tolerate that, so it produces recovery: magnesium at the right hour, the cold plunge, the breathwork, the 8.5 hours with a sleep-hygiene checklist attached, the yoga session logged in an app that will congratulate you for resting correctly. All of it is effort. Some of it is fine and some of it is pleasant and none of it is rest, because rest is the absence of a performance and this is a performance with a scoreboard.

And the scoreboard is where this stops being a matter of taste. A woman who is knackered because she has a job, a household, someone to care for and roughly four hours a week that belong to her does not have a cortisol problem. She has a workload problem, and a childcare problem, and possibly a sleep-is-being-taken-from-her-by-someone-else problem. Those are political and domestic conditions with political and domestic solutions, none of which are for sale. Recasting them as a personal optimisation failure is very convenient for everybody except her, because it moves the fault from the arrangement to the woman inside it, and then charges her for the correction.

So what is the alternative?

Not stoicism. I am not arguing that you should push through, which is the same error with worse branding. I am arguing for accuracy, and accuracy usually means naming the cause rather than the sensation.

If you are tired and you know why — the week, the job, the baby, the six months you have just had — the useful response is to subtract something, not to add a supplement. Fewer obligations, an earlier night, one afternoon in which you do not achieve anything and do not log it. That is unglamorous and it is free, and both of those facts are reasons you have not been sold it.

If you are tired and you do not know why, or it has lasted months, or it is out of proportion to your life, that is a reason to see a doctor and to ask specifically what has been ruled out. Blood tests are not glamorous either. They are, however, the part of this that can actually find something.

What I cannot tell you is whether your own tiredness belongs in the first category or the second, and I would be suspicious of anyone who claimed they could from a distance, including an app. That judgement is yours, and it is worth making deliberately rather than by default, because the default has been designed by people who are selling something.