I think there is definitely some connection between allergies and evolutionary principles. How can people be allergic to the natural environment? It also seems that the incidence of allergies is on the rise. I know of more and more people who suffer from allergies, and it also seems to get worse when you get older. I don't know the answer, but I have a few ideas. First, humans have not evolved to live indoors. The dust, mold, and bacteria that get trapped inside rooms may cause problems. Another issue may be man-made toxins that are in the air. This can't explain everything though, as people are allergic to grass and pollen. Is allergy medicine a big scam for the medical industry? Can the incidence of allergies be decreased by exercise? I would like to hear others' views on this.