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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.
They observed that participants consuming 7.2 g of fish oil per day for three weeks had lower cortisol levels after a stress test compared to those consuming a placebo. Omega-3 fatty acid foods include salmon, halibut, tuna, walnuts and soybeans.