Which groups? I'd be interested in someone substantiating these accusations.
EDIT: I appreciate the responses, but does anyone have a credible source? Amid criticism that what people have read has turned out untrue, let's be careful not to perpetuate the problem with more rumors.
They demonized saturated fat and pushed a switch to partially hydrogenated vegetable oils which had trans-fat. Now we say trans fat is so unhealthy that it should be banned. So a significant number of people got exposed to trans-fat due to their policy demands.
* I don't put much faith in Wikipedia, but the linked article says CSPI has been consistent for 20 years: From the mid-1990s onward, however, CSPI identified trans fats as the greater public health danger. ... In response, three trade groups - the National Restaurant Association, the National Association of Margarine Manufacturers and the Institute of Shortening and Edible Oils - "said the evidence [on trans fat] was contradictory and inconclusive, and accused [CSPI] of jumping to a premature conclusion"
EDIT: I appreciate the responses, but does anyone have a credible source? Amid criticism that what people have read has turned out untrue, let's be careful not to perpetuate the problem with more rumors.