Does the federal government use proper science in setting nutritional standards and advocating healthy diets? How about influential organizations like the American Heart Association? Science writer Gary Taubes, author of Why We Get Fat and What to Do About It, says many nutritional falsehoods have been propagated over the years based on flimsy scientific data.  Part of the problem, says Taubes, is that once the various institutions involved in public health have embraced a particular position, they’re loathe to ever admit they made a mistake. “Once you start giving advice, how do you pull back and say you were wrong?,” he asks. Watch his interview with Reason.TV’s Zach Weissmueller.