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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.
How To Increase Cortisol Levels Naturally. 1  Taking a diet to increase cortisol levels naturally such as eating food that are high in sugar and starch such as bread, pasta, and sweets. 2  Another way to increase the production of cortisol is by getting the right amount of sleep.