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13 Best and Worst Foods for Your Lungs

Smart food choices may help you breathe easier if you have asthma.

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It seems that every week there's a new headline on how caffeine might—or might not—affect your health. With regards to asthma, at least, caffeine is emerging as a good guy. 

One review of seven previously published trials found that caffeinated coffee might modestly improve airway function for up to four hours after it is consumed, when compared with drinking decaf Joe. 

"Caffeine is a bronchodilator that may improve airflow," says Dr. Graham. For the same reason, black tea might be beneficial as well. 

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