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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.
Some foods are high in fiber, calcium or iron and also contain large amounts of other nutrients, making them superfoods. Pumpkin seeds, dark chocolate and kidney beans make the list. Other superfoods high in fiber, iron or calcium include almonds, kale, blueberries, broccoli and avocado.