Don't know about research, but I have two pieces of anecdata:
The only kid i know of who was raised in clean room conditions became asthmatic around 8-10.
I also know of another kid that got rid of his semi severe peanut allergy by simply eating a peanut crumb every day, then 1/8, then a quarter then... you know the drill.
The only kid i know of who was raised in clean room conditions became asthmatic around 8-10.
I also know of another kid that got rid of his semi severe peanut allergy by simply eating a peanut crumb every day, then 1/8, then a quarter then... you know the drill.