“Studies have shown” or “a recent study concludes” or a “survey of studies indicates”….how many times do we read an article on food safety or policy which includes these time? All the time! But what does this really mean? How do we as lay people try to understand them and formulate our own understanding? Here is an excellent piece on just that topic from the Biofortified blog (which also has tons of other informative stuff): http://www.biofortified.org/2013/10/making-sense-of-lists-of-studies/#comment-227677
Reading the studies then gives us an idea of how complex the issues at hand really are and reducing them to slogans/memes is not useful. We have to be prepared to bring our full attention to food issues and also acknowledge that there are experts who would know more and be prepared to respect that as well.