Atopy affects up to half of the adult population in developed countries; yet, the great majority do not progress to develop asthma [ 12].
And about half of the children with widespread eczema develop asthma by their teenage years.
Adults who develop asthma may also have chronic rhinitis, nasal polyps, or sinusitis.
Allergies such as hay fever affect up to a fifth of the population worldwide and some develop asthma.
Mice, for example, no longer develop asthma when a particular enzyme is targeted.
In that group, those born by C-section were nearly 80percentt more likely than the others to develop asthma.
"Everyone from parents to policymakers is concerned by the steep rise in the number of children who develop asthma.
Theories come and go, and when you come right down to it, no one really knows why some people develop asthma and others don't.
Babies born by Caesarean delivery are more likely to develop asthma than those delivered naturally, doctors say.
Hungry seniors are 60percentt more likely to experience depression, 53 percent more likely to report a heart attack and 52percentt more likely to develop asthma.
A study published last week in JAMA Pediatrics shows that children who had a dog in their first year of life were 13% less likely to develop asthma by the time they were six than those from dog-free households.
