As someone that grew up on a farm (and a data point of 1), I am pretty damn healthy and very rarely ill. My wife on the other hand grew up in a spotlessly clea

As someone that grew up on a farm (and a data point of 1), I am pretty damn healthy and very rarely ill. My wife on the other hand grew up in a spotlessly clean house, and has a range of allergies, asthma, coeliac disease, allergic to asprin and anaesthetics.