[fr_freak]

How could so many people be allergic to their environment? It doesn’t make sense.

It's not entirely unrealistic. Only in the last 100 years or so have we had mass migrations of peoples to different regions and adopting different diets than those their ancestors have had traditionally for thousands of years. For example, if you take someone of northern European ancestry and stick them in the US Southwest, they will be exposed to a number of plants and other items that northern Europeans were never exposed to. Likewise for people from dry climates who move to, say, the Pacific Northwest where mold rules. Also, diets used to be region specific. Now you can get food from all around the world, year-round.

[TigersEye]

My DNA traces back from N. America to Scotland/England to Europe to Eur-Asia to Africa. I guess that’s why I’m not allergic to anything. /s