The Government's Bad Diet Advice - NYTimes.com - 0 views
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How did experts get it so wrong?
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the primary problem is that nutrition policy has long relied on a very weak kind of science: epidemiological, or “observational,” studies in which researchers follow large groups of people over many years. But even the most rigorous epidemiological studies suffer from a fundamental limitation. At best they can show only association, not causation.
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Instead of accepting that this evidence was inadequate to give sound advice, strong-willed scientists overstated the significance of their studies.
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