In particular, eating fruit such as apples is thought to improve lung function, which may help children with asthma control their symptoms.
The majority of children with asthma will carry the illness into adulthood.
That's not to mention children with asthma or mental health issues.
Richard Hubbard, professor of respiratory epidemiology at Nottingham City Hospital and a spokesman for the British Lung Foundation, said breath analysis was already being used to diagnose children with asthma.
These findings reinforce evidence on the impact of smoke-free legislation from studies in North America and Scotland, which also showed a fall in hospital admissions for children with severe asthma attacks.
Children and adolescents with asthma that is under control should aim to achieve the same level of exercise recommended by the CDC as young people without the condition, Dr. Craig says.
There was a sharp fall in the number of children admitted to hospital with severe asthma after smoke-free legislation was introduced in England, say researchers.
Two-thirds of the pediatric deaths linked to H1N1 have occurred in children with underlying illnesses such as asthma and neurological disorders, such as cerebral palsy.
Presenting their findings in the journal Pediatrics, they said the number of children admitted to hospital with severe asthma attacks was rising by more than 2% a year before the restrictions were introduced in July 2007.
"I feel there's a lot of education that still needs to take place" in the medical community, says Michele Shaw, a professor at Washington State University College of Nursing who studies exercise in children, with a focus on those with asthma.
The results confirm those of previous studies that found higher rates of asthma among American children compared with kids from other countries, and investigators have also reported similar differences in allergic diseases between immigrants and native-born citizens in Italy, Israel and Australia.
Children born with good lung function are less likely to develop asthma.
Children in at-risk groups, such as those with asthma, heart conditions or cerebral palsy, are already eligible to receive the vaccine from their GP.
We just had tremendous medical expenses with the formaldehyde, and I have two children that now have asthma, so we've been - it's been real slow for us.
When they compared place of birth with allergic-disease prevalence, the scientists found that children born outside of the United States were less likely to develop asthma or allergies compared with those born in the United States: 20% of foreign-born kids developed allergic diseases compared with 34% of the American-born children.
Experts say vulnerable groups include pregnant women, children under five, the over-65s and those with serious conditions such as heart disease, asthma, diabetes or immunosuppressive illnesses.
These six groups are nursing home residents, people with chronic medical conditions like asthma, the elderly, pregnant women, health care workers, and children from ages 6 months to 2 years, Butler said.
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