Dog Folks wrote:
Also, how many times has the medical community said:
"Coffee is bad for you"
"No, wait, coffee is not that bad."
"No, wait, coffee is harmless."
Actually, it's not the medical research community that is doing this; it is the media's spin on the results of correlation studies.
The results of these correlation studies have lots of caveats making for boring stories; therefore the media makes it sound like the study demonstrated cause and effect which correlations studies cannot do.
example:
The rate increase of autism correlates to the use of thimerosal in vaccines turned into thimerosal causes autism (subsequently proven incorrect). Oddly the rate increase in autism also correlates with population increases, greenhouse gas increases, inflation increases, the use of chemical contraceptives, the use of prescription drugs, the use of antibacterial soaps, etc.