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    Asthma and Diet

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    There’s no special asthma diet. We don’t know of any foods that reduce the airway inflammation of asthma. Beverages that contain caffeine provide a slight amount of bronchodilation for an hour or two, but taking a rescue inhaler is much more effective for the temporary relief of asthma symptoms.

    However, a good diet is an important part of your overall asthma treatment plan. Just like regular exercise, a healthy diet is good for everyone. That goes for people with asthma, too. Obesity is associated with more severe asthma, so you want to take steps to maintain a healthy weight.

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    Asthma Causes and Triggers

    No one really knows what causes asthma. What we do know is that asthma is a chronic inflammatory disease of the airways. The causes of asthma symptoms can vary from person to person. Still, one thing is consistent with asthma: when airways come into contact with an asthma trigger, the airways become inflamed, narrow, and fill with mucus. When you have an asthma attack, spasms of the muscles around the airways, inflammation and swelling of the mucosal membrane lining the airways, and excessive amounts...

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    What’s more, many doctors suspect that the specific foods you eat might have a direct impact on your asthma. But further research needs to be done before we understand the exact connection between asthma and diet. If you are allergic to certain foods, you should avoid them. Allergies can trigger asthma symptoms.

    Asthma and Nutrition

    The incidence of asthma has risen in the United States during the past three decades, and many researchers believe that our changing diets have something to do with it. As Americans eat fewer and fewer fruits and vegetables and more processed foods, could it be that we’re bumping up our risk of developing asthma? Several research studies have suggested this, and others are ongoing, but the connection between diet and asthma remains inconclusive.

    There’s evidence that people who eat diets higher in vitamins C and E, beta-carotene, flavonoids, magnesium, selenium, and omega-3 fatty acids have lower rates of asthma. Many of these substances are antioxidants, which protect cells from damage.

    One recent study of asthma and diet showed that teens with poor nutrition were more likely to have asthma symptoms. Those who didn’t get enough fruits and foods with vitamins C and E and omega-3 fatty acids were the most likely to have poor lung function. A 2007 study showed that children who grew up eating a Mediterranean diet -- high in nuts and fruits like grapes, apples, and tomatoes -- were less likely to have asthma-like symptoms.

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