How to Reduce Cortisol: What Food Can and Cannot Do

A video told you that your puffy face, your tiredness and the weight around your middle are one hormone, and that one bottle fixes it. It was convincing. That is the problem.

The first thing I ask a client who tells me it is her cortisol is what she actually ate yesterday. The second is what time she went to bed. Usually: a coffee, something small at two, a real meal at eight, six broken hours of sleep, and a forty-euro bottle on the counter.

The story she was sold is a good one. One cause for a set of real symptoms, one thing to buy. That is what anybody wants when they are that tired.

01

What cortisol actually is

Cortisol is a hormone your adrenal glands make, and you need it. It gets you out of bed, helps regulate blood sugar and blood pressure, and is part of how you handle anything demanding.

It runs on a daily rhythm: highest in the morning, rising sharply in the half hour after you wake, then falling to its lowest at night. That rhythm is why the sleep advice below matters.

Cortisol is not a toxin, and having it is not a condition. A hard workout raises it, and so does waking up. When something genuinely has gone wrong, it is a specific disease with specific signs.

02

The part nobody selling you a supplement will mention

Tomiyama and colleagues, in Psychosomatic Medicine in 2010, randomly assigned 121 women for three weeks to one of four conditions: tracking calories, being fed 1,200 calories a day, both, or neither. Saliva cortisol was sampled across the day, before and after.

Restricting calories increased total cortisol output. Tracking calories increased perceived stress.

Read that again if you have been living on 1,200 calories and wondering why your hormones feel like the enemy.

Now the careful part. One study is one study: a single trial, 121 women, three weeks. It does not mean every deficit raises cortisol, that dieting is dangerous, or that eating more makes you lose weight. Cortisol does not cancel out energy balance. What it says is that severe restriction registered on those women as a physiological stressor, making your eating and your cortisol one problem rather than two.

If you eat very little and the scale has not moved in months, why you might be eating at a calorie deficit and still not losing weight covers the rest. Check the deficit first.

03

The cortisol belly fat question, answered properly

This is what most women came here for, so I will not dodge it.

Epel and colleagues, in Psychosomatic Medicine in 2000, studied 59 healthy premenopausal women, 30 with a high waist-to-hip ratio and 29 with a low one, over four days of laboratory sessions. Those with more central fat reported more chronic stress and secreted more cortisol in the first stress session.

Now the honest reading. A cross-sectional study of 59 women. It shows an association between where fat sits and how cortisol responds to stress. It is not proof of cause, it does not show cortisol put the fat there, and the authors call their own findings support for a hypothesis, not proof of one.

So cortisol belly fat, sold as a mechanism you can supplement your way out of, goes well past what the study found. Calling it all nonsense goes past it the other way. The truth sits between them.

Where fat sits is also shaped by age, genetics and menopause: see belly fat during menopause and menopause weight gain.

04

What actually raises cortisol, in rough order

Not sleeping enough. This is the big one, and it is not a food. Leproult, Copinschi, Buxton and Van Cauter reported in Sleep in 1997 that after partial or total sleep deprivation, evening cortisol ran higher the next day. That was a small study in young men, so treat it as a signal, not a number for you. No eating pattern makes up for five hours a night.

Chronic unmanaged stress. Not the kind you breathe away in an app. A job, caring for someone, money, a relationship. The least fixable item here, which is why it is second, not first.

Severe calorie restriction. See above.

Training you are not recovering from. Exercise raises cortisol for a while, which is normal when recovery matches it. The problem is training hard five or six times a week while underfed and undersleeping. I would not tell a healthy woman to stop, only ask whether her performance is falling.

Alcohol. It damages sleep quality even when it helps you fall asleep, which puts it back at the top of this list.

Caffeine raises cortisol acutely too, mostly in people who rarely drink it. The real problem with a late coffee is your sleep.

05

How to reduce cortisol with food, honestly

Nothing on your plate lowers cortisol. Not kiwi, not dark chocolate, not any green powder. What food can do is take away the things that raise it.

06

A day that looks like enough food

Deliberately not small. If under-eating raised the hormone, a day that looks like a diet plan defeats the point.

07

What the internet is selling you

Adrenal fatigue

It is not a recognised diagnosis. Cadegiani and Kater reviewed 58 studies for BMC Endocrine Disorders in 2016 and concluded there is no substantiation that adrenal fatigue is an actual medical condition. Their word for it was myth.

Your tiredness is real. The label is not, and the supplements sold against it treat something never shown to exist.

Cortisol face

A phrase from social media, not a medical finding. Facial puffiness has ordinary explanations: a salty dinner, alcohol, a bad night, crying, allergies, your cycle. A rounded face from high cortisol arrives with the other signs in the next section.

Home cortisol tests

Doctors do use cortisol tests. Nieman and colleagues set out how in the Endocrine Society guideline published in The Journal of Clinical Endocrinology and Metabolism in 2008: late-night salivary cortisol or 24-hour urinary free cortisol, timed properly and read against your history. A direct-to-consumer stress hormone panel is not that. Cortisol swings through the day by design, so one untimed number tells you nothing you can act on. If yours came back odd, take it to a doctor.

Ashwagandha and cortisol detox blends

The blends first. There is nothing being detoxed, and no evidence they do what the packaging implies.

Ashwagandha deserves a fairer hearing. Lopresti and colleagues ran a 60-day randomised, double-blind, placebo-controlled trial in Medicine in 2019: 60 stressed but otherwise healthy adults took 240 mg of one standardised extract or a placebo. The extract group had a greater fall in morning cortisol and a modest improvement on an anxiety scale. Real, and also thin. Sixty people, two months, one branded extract, and the authors said larger studies are needed. Supplements are not regulated the way medicines are, so a bottle may not hold what was tested.

So it is not snake oil. It is also not a treatment for adrenal fatigue, cortisol face or cortisol belly, because there is nothing there to treat. If you want to try it, tell your doctor, particularly if you take thyroid or sedative medication.

08

When it is actually medical

There is a real disease of high cortisol. Cushing's syndrome. It is uncommon, and a doctor diagnoses it, never a video or a home kit. The Endocrine Society guideline recommends testing when the picture gives real reason to suspect it, not screening everyone who is tired and has gained weight.

The features that warrant an appointment are more specific than exhaustion: wide purple stretch marks, muscle weakness in the thighs and upper arms so standing from a chair or climbing stairs gets hard, skin that bruises easily, a rounded face alongside those other signs, and blood pressure or blood sugar that is difficult to control.

Tiredness and weight around your middle, on their own, are not that. They are the two most common things in my inbox, and the answer is usually sleep, stress, under-eating or perimenopause.

For everyone else the plan is duller than the internet's and it works better. Eat enough. Eat at sensible times. Protect your sleep like a treatment.