Sometimes a health or science story comes up in the news that catches people's interest. Here is some simple advice:
go find the original publication or read the abstract on PubMed( http://www.pubmed.gov/).
Often a journalist will pick up on one aspect of a study and not mention other aspects, or limitations, or may misinterpret the conclusions of the study authors. So take a look at the original yourself. Peer-reviewed articles published in highly-ranked journals put out quality work. Getting through peer-review is a rigorous process as exemplified in this video Scientific Peer Review ca. 1945.
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