Sure, it sounds like a good idea at first; our bodies evolved to process the foods our cave-dwelling ancestors could hunt and gather and so shunning all that farming and industry have brought will mean we live healthier, skinnier lives. What has resulted is a kind of carbo-phobia that causes the Paleo enthusiast to run screaming from the room at the sight of a sandwich. But as Paleo swept the nation and more and more research went into the effects of the diet, the disadvantages began to emerge.