I think this article does a good job of reviewing a number of recent studies seriously undermining the official "health" recommendations considered for decades to be rock solid. From guidelines on "ideal" (and preferably low) BMI to the recommendations to eat tons of PUFA, the official stance on so many medical "truisms" is slowly starting to get unraveled.
http://www.newstatesman.com/lifestyle/2 ... ary-advice
http://www.newstatesman.com/lifestyle/2 ... ary-advice