Why the Paleo diet is too simplistic

This article talks about how humans vary in how many copies we have of a gene that codes for a carbohydrate-processing enzyme. Humans who live in societies where starch is a major part of the diet tend to have more copies.

http://scienceblogs.com/pharyngula/2008/12/11/amylase-and-human-evolution/

When I say the Paleo diet is too simplistic, I mean that this is evidence human digestion has evolved since the introduction of agriculture. If you are on the Paleo diet and feel happy and healthy, that's cool.