I was cruising That's Fit and came across this story: http://www.thatsfit.com/2009/12/14/fat-intake-does-not-affect-weight/
It was referencing this study: http://www.ajcn.org/cgi/content/abstract/90/6/1632
I find this really satisfying in a "nana nana boo boo" sort of way. Hello my 5 year old self...
Still the author covering the study can't bring themselves to loosen the reigns too much.
I didn't read the study but the article seems to group saturated and trans fat together in one group...