And bad science:
This is an hypothesis that grew out of the observations of one very zealous University of Minnesota nutritionist in the 1950s, a fellow named Ancel Keys, who came up with this idea that dietary fat raised cholesterol, and it was raised cholesterol that caused heart disease. At the time there was effectively no meaningful experimental data to support--I'll rephrase that: There was no experimental data to support that observation. It seemed plausible, though....
Good intentions, is there anything they can't do?
This is another interesting time sink. Dietary fat is used as an example, but the subject here is bad science. Economics even gets tied in. And salt! And Sponge Bob!
OK, not Sponge Bob, but listen to it anyway.