People often ask me why are allergies on the increase, and is it just being over diagnosed? Well the answer is no, the increased prevalence is not secondary to over- diagnosis, in fact 1 in 10 Australian babies born today will develop a food allergy. We do not know why exactly but evidence suggests it is a combination of genetic predisposition as well as environment that determines allergies. Leading researchers at the Murdoch Institute in Melbourne hypothesize the 5 D's as