Yogurt regulates your immune system and keeps it stress-free. It contains probiotics (good bacteria), which "restore the balance between good and bad bacteria in your body," says Mohning. Studies show that probiotics have the potential to alleviate allergy symptoms such as eczema. Have a cup of fat-free or low-fat yogurt in the morning. If you can't tolerate dairy products, Mohning says you can get the same benefits from an over-the-counter probiotic supplement.