I suspect, and hope, that for readers here my views on nutrition are pretty well known. I contend that we do, indeed, know the basic theme of optimal eating for health -- just as surely as we know that no one variation on that theme can claim the tiara on the basis of data. We are not clueless about the basic care and feeding of Homo sapiens. America runs on Dunkin' on only its best days, running preferentially on BS most of the time. Our seemingly inexhaustible penchant for silver bullets, scapegoats, and naïve stupidity is far more toxic than either sugar or saturated fat.
Whatever the probability, in the near term or long, of overcoming the prevailing penchant for dogmatic religiosity about food, and rallying to the theme of healthful eating -- the stakes are already much bigger than our organ systems. They have evolved to encompass our ecosystems.
Also read: Choosing low-carb foods can help your health