You already know that stress can cause health problems. When you experience stress, your body's natural reaction is to release the hormone cortisol. In small doses, cortisol isn’t harmful to your health. But if you experience chronic stress, elevated cortisol levels over time may add to sleep, mood and memory problems, and could even contribute to abdominal obesity. Fortunately, you can fight back! This grocery list has a tasty assortment of cortisol-reducing foods to get you started.