Interesting study given that asthma and allergies are endemic amongst children born and raised in metropolitan environments. I often wondered whether it was the lack of pollution, use of more home grown foods or early exposure to micro-organisms.
Another reason to let your children get down and dirty outside.
"The reason for that, the study found, is that from an early age, these children were heavily exposed to microorganisms in the farming environment.
....These microorganisms trick the immune system by stimulating it intensely, thus strengthening and balancing it throughout the rest of the children's lives.”