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Foods with a high glycemic index cause cortisol levels to rise. These foods include products high in sugar and refined starches. Skipping meals can also boost cortisol levels. Harding says a high cortisol level at night can disrupt sleep.
Green and black tea also can lower cortisol, but itâs still not clear whether the positive effect on cortisol is from the chemical compounds in tea or from the calming effect when making tea. One Japanese study of women over age 50 who regularly practiced the Japanese tea ceremony found a longevity effect.