Asthma is a lung disease that causes obstruction of the airways.  The spasms that typify the condition are not the cause of asthma but as a result of chronic inflammation and hypersensitivity of the airways to certain stimuli.  Common asthma provoking allergens include: animal fur, chemicals, drugs, dust mites, environmental pollutants, feathers, food additives (such as sulphites), fumes, mould and tobacco smoke - but in those susceptible, any kind of allergen can precipitate an attack. 

Other things that may bring on attacks include adrenal disorders, anxiety, changes in temperature, exercise, extremes of dryness or humidity, fear, laughing, low blood sugar and stress.

Studies have shown that people with asthma may fare better on a vegetarian diet.  Nutritional therapists often recomend various supplements: 

Increase vitamin C containing foods and supplement with vitamin C around 1000-2000mg per day may be of benefit.

Supplementation of GLA such as in Evening Primrose Oil may be beneficial (an omega-6 oil).  Other oils which have a beneficial effect on the immune system and healing are those found in coldwater fish such as salmon, mackerel, trout, sardines, herrings.  Linseed (also known as flaxseed) is also beneficial – these also contain omega-3 oils. 

Some people have found that additives such as sulphites (often found in processed foods and alcohol) can contribute to wheezing. Some studies report that 5-11 percent of all asthmatics are sensitive to sulphites.  Other additives may also trigger an attack so a whole food natural diet is recommended.

Include onions and garlic in your diet - these contain quercetin and mustard oils, which have been known to inhibit an enzyme that aids in releasing inflammatory chemicals.

Certain foods may contribute to allergic reactions these may include: alfalfa, corn, peanuts, soy, eggs, beets, carrots, colas, cold beverages, dairy products (including milk and ice cream), fish, red meat (especially pork), processed foods, salt, spinach, chicken and turkey, white flour and white sugar.  If you suspect that any of these are causing allergic symptoms, try eliminating them from your diet for two weeks.  After this time, reintroduce them in a significant amount to see if there is an adverse reaction. Consider an allergy test if problems persist.