A Food exclusion diet is recommended, since food sensitivities can often be an underlying factor, especially in childhood asthma.
In one study, 91 percent of children with a respiratory allergy found their symptoms improved on a six-Week diet that excluded common problem foods, including grains and dairy products.
Fish oils may help, since asthma may be related to an imbalance in fatty acids in the diet. Excessive amounts of omega-6 fatty acids (found in vegetable oils) and a relative lack of omega-3 fats (found in oily fish and some nuts and seeds) may promote inflammation of the airways and aggravate asthma. Try cutting back on margarine and vegetable oils and eating at least two portions of oily fish a week (such as salmon or mackerel). Children should take 300mg of fish oil per day. A number of studies suggest that this is worth trying.