Chronic stress raises cortisol, which increases appetite, favours abdominal fat storage and reduces insulin sensitivity. The mechanism is real, and it explains weight that gathers around the middle during a difficult period. The supplements sold to block cortisol, and the salivary panels sold to measure it, mostly are not supported.
What cortisol does
Cortisol is not a villain. It follows a daily rhythm, peaks shortly after waking, and is necessary for blood pressure, blood glucose and the immune response.
The problem is chronic elevation. Sustained high cortisol raises appetite — particularly for energy-dense food — promotes fat storage preferentially in the abdomen, reduces insulin sensitivity, breaks down muscle protein and disrupts sleep. The last one closes a loop, because poor sleep raises cortisol further.
Is this what is happening to you?The two-minute check further down asks four questions and shows the result immediately. No email, no call.
Take the 2-minute checkWhy the abdomen
Visceral fat tissue has a higher density of cortisol receptors than subcutaneous fat, which is why chronic stress produces a particular distribution rather than uniform gain.
It also explains the pattern people describe where weight appears around the middle during a difficult period at work, sometimes without much change in total weight at all.
2-minute check
What is causing your weight gain?
Four questions. Your result appears immediately — we do not ask for an email.
What happens when you diet?
How is your energy and temperature?
Do you get strong cravings or afternoon crashes?
How do you sleep?
No strong metabolic driver shows up
That usually means the plan is the issue rather than your physiology — a much easier problem.
A driver may be involved
Thyroid and insulin are the two worth testing first. Both are common and both are treatable.
Your answers strongly suggest a metabolic driver
This is the pattern where dieting alone tends to fail. Testing thyroid, insulin and vitamin D is the sensible next step.
This check is an indication, not a diagnosis. It does not replace medical advice.
What the evidence supports, and what it does not
It is worth separating these clearly, because the space is crowded with products.
- Supported: regular physical activity, which improves cortisol regulation despite being a stressor itself
- Supported: adequate sleep, which is both cause and consequence in this loop
- Supported: slow breathing and meditation, with reasonable evidence for measurable effects
- Supported: social connection, which has more evidence behind it than most supplements do
- Some evidence: ashwagandha, with small trials suggesting an effect on subjective stress. Promising rather than established.
- Not supported: cortisol-blocking supplements, adrenal fatigue as a diagnosis, and salivary cortisol panels sold direct to consumers
What nutrition contributes
Stable blood glucose reduces one physiological stressor, because a glucose crash triggers a cortisol response of its own. Adequate protein protects against the muscle breakdown that cortisol promotes. Magnesium is depleted by chronic stress and is involved in the stress response. Caffeine raises cortisol, so a high intake during a demanding period is working against you.
What nutrition cannot do is resolve the source of the stress. Where that source is ongoing and significant, nutrition is support around a problem that needs its own attention, and we would rather say so than sell a plan as a solution to it.
In short
Questions we are asked
Should I get my cortisol tested?
Direct-to-consumer salivary cortisol panels have limited clinical value. Where a genuine disorder of cortisol is suspected, an endocrinologist tests for it properly. That is a different thing from a wellness panel.
Is adrenal fatigue real?
It is not a recognised medical diagnosis, and systematic reviews have not supported it. The symptoms attributed to it are real and usually have other explanations worth investigating — thyroid, iron, vitamin D, sleep apnoea or depression.
Reading about it is the easy part.The assessment turns this into your own numbers — free, with a free first consultation, and no figure quoted that we cannot substantiate.
Start my free assessmentConditions this relates to
Recipes that put this into practice
Moong dal chilla
Thirteen grams of protein at breakfast, and the difference shows up at four in the afternoon.
See the recipe →Sprouted moong salad
Eaten ten minutes before the rice, not with it. The sequence is the intervention.
See the recipe →Barley and vegetable khichdi
The same comfort food, with three times the fibre and a different afterwards.
See the recipe →Related reading
Why weight will not move when your thyroid is underactive
When effort stops producing a result, the problem is often not the effort.
Read →Insulin resistance, explained without the jargon
One mechanism sits underneath PCOS, fatty liver, acne and stubborn weight.
Read →Why your waist matters more than the scale
Where fat sits matters more than how much there is — and BMI misses it entirely.
Read →References
- Endocrine Society — clinical practice guidance on adrenal disorders.
- World Health Organization — guidelines on mental health at work.
- [Further references to be completed by the medical review panel.]
This article is general health information, written by a clinical nutritionist and reviewed by a doctor. It is not a diagnosis and it does not replace advice from your own clinician. Never change prescribed medication on the basis of what you read here.