It is "common knowledge" that cholesterol and saturated fat cause heart disease. This "knowledge" comes from the same people who believe that obesity is caused by over eating and a lack of exercise. Both of these theories may SOUND good, but, like the belief in big foot, ghosts and the Loch Ness monster, it just doesn't hold up to scientific scrutiny.
This series of short videos show Dr. Malcolm Kendrick speaking at a British Medical Association meeting in Leeds. He examines the "common knowledge" and seriously makes you wonder how people came to believe it in the first place.