http://www.youtube.com/watch?v=mJYlXmfb08M
Observational epidemiological studies showed correlation and are hypothesis-generating, as opposed to hypothesis-testing. Experimental research (gold standard being randomized controlled) determine causation. Ancel Keys' Seven country study & China study are epidemiologic studies and did not prove causation. That is why you hear all kinds of conflicting results on the news media because these results are all from observational studies which does not prove causation. Low fat diet recommendations started out of observational studies & was never proved to be useful in subsequent science. Here's an interesting debate: Plant-based diet Vs High fat, moderate protein diet. Click the following link to view video on Youtube
http://www.youtube.com/watch?v=mJYlXmfb08M
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