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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 flavonoids, antioxidants and other phytochemicals include: 1  Strawberries. 2  Apples. 3  Celery. 4  Cranberries. 5  Onions. 6  Garlic. 7  Green tea.