"Government made a big mistake with the dietary guidelines," says Nina Teicholz, author of the New York Times bestseller The Big Fat Surprise: Why Butter, Meat and Cheese Belong in a Healthy Diet. "Given the track record that they have so far, you can really make a plausible argument that they've done more harm than good."

Reason's Alexis Garcia sat down with Teicholz to discuss how decades of faulty nutrition science can be traced back to the flawed research of a Minnesota doctor named Ancel Keys.