Eating more fat might tell your body to stop producing so much of the stress hormone cortisol, as if it’s hitting a brake on your stress system.

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Evidence from Studies

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Contradicting (1)

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Glucose but not protein or fat load amplifies the cortisol response to psychosocial stress.

Randomized Controlled Trial

Human

2002 May

The study gave people fat, sugar, or protein before a stress test and found that only sugar made cortisol go up — fat had no calming effect, so it doesn’t suppress stress hormones like the claim says.

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Similar Assertions

When obese men lose weight by dieting, their body doesn’t make less cortisol overall—but because they still have some fat left, the cortisol they do have is now more concentrated relative to that fat, which might trick their body into putting fat back on, especially around the belly.

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