Some myths about mucus
The National Asthma Council has warned parents who have removed dairy foods from their child's diet, due to fears that they will act as asthma triggers, that they are inadvertently placing their children at risk of developing osteoporosis and malnutrition.

There is a common view that people with asthma should avoid milk and other dairy products, because they are said to promote the production of mucus, and hence trigger asthma attacks. This perception dates back more than 2000 years, when some alternative medicine systems attributed excess mucus production to the consumption of milk.

According to the National Asthma Council, it is very rare for dairy foods to trigger an asthma attack.

Genuine allergies to cow's milk are caused by a milk protein, and generally lead to gastrointestinal symptoms, rather than respiratory difficulties.

How do milk and dairy products affect my asthma?
When milk is consumed it temporarily thickens saliva in the mouth, a sensation that many people mistake for respiratory mucus production. There is no clinical evidence to suggest that reducing or stopping consumption of milk and dairy products will help relieve symptoms of asthma.

Asthma and your diet
Adverse reactions to any foods, including dairy products, are relatively rare in people with asthma — less than 2 per cent of adults and 11 per cent of children with asthma experience an asthma attack due to food.

Getting enough calcium
Dairy foods are a major source of calcium, as well as vitamins A and B12, riboflavin and protein. More than half of the recommended daily requirement for calcium in the Australian adult diet is provided by milk and dairy products.

The National Asthma Council reports that many people with asthma are unnecessarily depriving themselves of a rich and important source of nutrients by limiting dairy foods.

The National Health and Medical Research Council (NHMRC) has issued the following recommended dietary intakes of calcium for Australians:

If you choose to avoid dairy products because of concerns about your asthma, it is important to identify appropriate substitutes to ensure you don't compromise your or your child's intake of nutrients.

While milk and other dairy products are the richest source of calcium, it is also found in:

Major medical organisations advise that the best way to get all the nutrients you need, including calcium, is through eating a balanced diet. However, in some situations, a calcium supplement may be indicated.

Talk to your doctor
If you have asthma and you are concerned about the effect of milk and dairy products on your condition, talk to your doctor or health professional.

Unless you have been tested and diagnosed by a specialist doctor as having an allergy to dairy foods that is triggering your asthma, there is no need to cut them out of your diet.