A link between asthma and being overweight could mean that adults who shed the fat might also ease their asthma, researchers said.
But their study was not able to determine if the added weight caused the asthma, or if asthma resulted in the weight gain.
About 10.3 million Americans, nearly 6% of the population, suffer from asthma. And they are more likely to suffer from other maladies such as ulcers, hypertension and depression, according to the study of 1,130 adults ages 17 to 96 living in Oregon, Idaho and Washington.
Nearly 55% of Americans are considered overweight, and 22% qualify as obese, the report said.