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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.
Foods that are rich in vitamin C include: 1  Guava. 2  Cranberries. 3  Kiwi. 4  Raspberry. 5  Red bell peppers. 6  Broccoli. 7  Spinach.