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Blame the media.
The popular media, aware of the huge public appetite (so to speak) for nutrition information, and moving, as they do, much faster than science, frequently overhype individual studies, and thus make it seem as though the scientific understanding of the right way to eat is changing more rapidly than it actually is. Several years ago, you may recall, the media were touting soy as the ultimate superfood; a few years later, inevitably, they were hyping the dangers of eating too much soy. But if you had read only the studies on which these stories were based, you would have seen nothing like this dramatic reversal.