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Cortisol is a curve, not a number, and stress bends it two ways

Cortisol peaks after waking and falls away; across the pooled research, the people whose fall is shallowest have worse health. Ordinary work pressure raised the morning surge, burnout went with less.

Cortisol

A cortisol test gets read as one number, high or normal. Cortisol is a curve: it peaks within the hour after waking and falls away, and the people whose fall is shallowest have worse mental and physical health. The morning surge moves in opposite directions depending on the kind of stress, bigger under ordinary work pressure, smaller with burnout, so a high reading and a low one can both mark a problem. All of it watched rather than assigned. One sample cannot tell you which curve you are on.

The findings behind this

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Mood & wellbeingHow sharply your cortisol falls through the day tracks your health

Cortisol normally peaks soon after waking and falls away. Across a large pooled body of research, the people whose fall is shallowest had worse mental and physical health.

★★★Well replicated — this finding’s sources average out to meta-analyses, systematic reviews or high-powered trials.Every study pooled here watched people rather than assigning anything, so a flat curve may mark illness already underway rather than cause it. The slope was measured differently from study to study, from two saliva samples a day to six or more, which blurs the pooled figure.Click to keep this openAge wellCortisol
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Mood & wellbeingOrdinary pressure raised the morning surge; burnout went with less

In the pooled research, ordinary work and life pressure went with a bigger cortisol surge in the 30 to 45 minutes after waking. Exhaustion and burnout went with a smaller one.

★★★Well replicated — this finding’s sources average out to meta-analyses, systematic reviews or high-powered trials.Most of the pooled studies took a single snapshot rather than following anyone, so nothing here shows stress moving the surge. The stress measures themselves are a mixed bag, from job strain to burnout, and they do not all point the same way, which is the finding rather than a flaw in it.Click to keep this openManage stress and anxietyCortisol

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