Depending on who the study was done for, some studies show grains are great, others show they are dangerous, it all depends on which you want to believe. I never recommended anyone to avoid them. Go back and re-read.
Mark posts plenty of studies in his posts so I will just link to his threads.
http://www.marksdailyapple.com/why-g...are-unhealthy/
http://www.marksdailyapple.com/definitive-guide-grains/