Allergies has exploded in recent decades. It's a rather new phenomena. Ask a great grand parent. I'm sure that's only a coincidence. Or, let's realize everything is tainted; food, water and air. Then, what does the DS and their puppets start doing? Start blaming problematic foods (which is everything). Sick? No worries, we have drugs to fix it. Kill us by poisoning or thin the herd by starving us to death because of these food intolerances.
When people say our ancestors were tougher they might not have been kidding afterall. Our ancestors didn't have psychopaths mess directly with the immune system of human beings.