A quick google search showed me that being allergic to dairy is the most common food allergy within young children in the US. It is still one of the most common food allergies after the age of 16 despite many growing out of it. A similar problem is lactose intolerance which affects 30 million Americans ages 20 and above. Having a food allergy to eggs is also common.
Has Aajonus talked about any of these things? I'm new to the primal diet so maybe these issues already have their solutions that I haven't seen yet.