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Tomatoes

Here, it's all about the antioxidant lycopene. "Our research showed that lycopene reduced inflammation in the lungs and the number of cells that secrete mucus—both are responses to allergens," says co-author Lisa Wood, PhD, a nutritional biochemist and senior lecturer at the University of Newcastle in Australia.

Although it was an animal study and more research is needed, eating concentrated sources of lycopene (cooked tomatoes are a better source than raw ones) may help allergy sufferers breathe easier.

Next: Vitamin-D-fortified milk