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“Use of these types of studies happens far more often than we would like, leading to dietary guidelines that may not be based on the best available evidence. But last week, the government started to address that problem, proposing new guidelines that in some cases are more in line with evidence from randomized controlled trials, a more rigorous form of scientific research.”

http://www.nytimes.com/2015/02/24/upshot/behind-new-dietary-guidelines-better-science.html?abt=0002&abg=0