Bedrockgames
Legend
The fact that food and respiratory allergies align with income suggests environmental considerations, rather than genetic, at least for now.
http://www.cdc.gov/nchs/data/databriefs/db121.htm
(I make an effort to get my daughter out-of-doors and around/handling animals; I don't know if that's why, but she doesn't have any allergies, hurrah))
That is true but they could also be genetic disorders that triggered by environmental causes. I believe there is also an increase in autoimmune diseases that are genetic, but these increases, like allergies, are associated with income levels (i could be wrong though, as I am going from memory here).