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Apple-shaped women's asthma risk
Reported September 01, 2009
Being overweight is well known to raise the risk of asthma.
But the latest study suggests that the amount of weight women carry around
the abdomen might be particularly important.
The study, by the Northern California Cancer Center at Berkeley, appears in
the journal Thorax.
The researchers analysed data on 88,304 female teachers and school
administrators.
The results showed that overweight women were 40% more likely to have asthma
than women of a normal weight.
Asthma was more than twice as likely in obese women, and more than three
times as likely in extremely obese women than in those of normal body
weight.
But perhaps more surprisingly, the researchers also found that women of
normal body weight, but with a waist circumference of more than 88cm were
also at increased risk - around a third higher than those with a smaller
waist.
Overall, 5.4m people in the UK have asthma, and rates have been rising in
recent years.
Body mass index (BMI) has been widely used as a standard measure of obesity.
But some researchers argue that waist circumference may be a more useful
measure because it more closely reflects levels of visceral fat deposits
found around the body's organs.
Visceral fat is metabolically different from other types of fat found in the
body, and may have different - and more profound - effects on health.
Researcher Julie Von Behren said: "Visceral fat is metabolically more active
- it can produce compounds that may cause inflammation. Inflammation may
then be related to asthma."
Healthy lifestyle
Leanne Metcalf, director of research at the charity Asthma UK, said the
researchers had not taken into account other factors which might have
influenced the development of asthma, such as a family history of the
condition.
However, she said: "As this study involves such a large number of women, the
results are likely to have some significance.
"It is important that people with asthma eat a healthy, balanced diet, which
is low in fat and sugar, and take regular exercise.
"Taking these steps can aid weight loss, improve lung function and help get
asthma symptoms under control, especially given the established links
between high levels of abdominal fat and other long-term health conditions."
Dr Noemi Eiser, of the British Lung Foundation, agreed that the study
reinforced the need for women to lead a healthy lifestyle and for them to be
more aware of the health risks of having a large waist size.
Source : BBC News |
