I can't disagree with you about my sourcing one of the "Propaganda Networks". I frequently call the"News" by the phrase "Todays Lies".
I read the Forbes article and quickly dismissed it as having been written by a "Critic"; in other words someone who had an opinion (or assigned article to write), but didn't really understand the science, hadn't read the original study (yes, I did), and had not even read the article he had referenced in Newsweek http://www.newsweek.com/american-researc.... The author in Newsweek had done his homework by reading the study or at least the summary.
Strangely enough when I read the Forbes article what I did see was that these Doctors had gone Rogue and not followed the prescribed, ordered doctrine. They found something interesting and went off and investigated it, instead of breaking it down into a lifetime of studies (and grant applications).
THE TRULY ALARMING THING HERE is that I can't find any further studies on this. Of course a 10% to 20% reduction in mental function, would be a significant reduction in benefit to an employer, but a significant benefit to a politician.

Benjamin Franklin; "When the people find they can vote themselves money, that will herald the end of the republic."
What he missed was; "When politicians learn that they can utilize tax money to buy votes, that will herald the end of the republic."