When you have asthma, your diet plays a key role in managing your symptoms. In general, it's best to avoid sulfites, which are a type of preservative, that may worsen asthma. Examples include wine, pickled food, shrimp, dried fruits, and bottled lemon or lime juice. Foods that can cause gas may also put additional pressure on your diaphragm, especially if you have acid reflux. Examples include cabbage, beans, onions, garlic, fried foods, and carbonated beverages.
