Obesity May Raise Kids' Asthma Risk
Breathing Problems During Sleep Also Raise Risk
Cynthia Dennison Haines, MD
Childhood obesity and asthma may be connected, but it's not clear which comes first.
Children with an active wheeze had significantly higher BMI and a greater prevalence of obesity, write researchers. Although there is speculation that asthma predisposes to obesity by reducing physical activity, this has not been shown to be the case. However, recent studies show that obesity precedes the development of asthma.
Both conditions are rising among American kids and adults, and asthma is increasing in developing countries worldwide.
There seems to be a relationship between asthma and obesity -- and trouble breathing during sleep could be part of the puzzle, a new study shows.
Sleep-disordered breathing, characterized by snoring, could be the pathway mediating asthma and obesity.
That's the latest news in the ongoing debate about asthma and obesity.
New Findings on Obesity and Asthma
Doctors at Cleveland's Case School of Medicine recently studied 788 kids aged 8-11 years for asthma, wheeze, obesity, and breathing problems during sleep. The researchers made sure enough minority and prematurely born children were included.
The children's height, weight, and history of wheeze and asthma were noted. The kids took a breathing test and sleep studies were done at home using monitors. Disordered sleep disturbances were defined either by sleep apnea or by snoring habits. In sleep apnea, people regularly stop breathing for 10 seconds or longer during sleep.
The vast majority of the kids (600) had no breathing problems. Kids with wheezing/asthma had the usual risk factors such as being male, black, born prematurely, and had a mother with a history of asthma. Yet kids with wheezing/asthma were also more likely to have a higher BMI.
Obesity was significantly associated with both asthma and wheeze. It nearly doubled the risk of asthma, raising the risk by 1.8 times. Obesity also raised the risk of wheeze 1.6 times.
By comparison, about 14% of the kids without wheeze or asthma were classified as obese -- identified as being heavier than 95% of their peers.