Food Allergies

I don't believe in them.  When I was a kid we all went to birthday parties and ate cake and ice cream.  No one was lactose-intolerant, no one got spelt cake, or whatever, because they were allergic to gluten.  Kids ate PB&J for lunch, just like their parents did.  I just can't believe that in a single generation we've gone from largely omnivorous to wildly limited in our ability to digest food.  Allergies are usually imaginary and I don't approve of them.