Most of us assume, given the long history of the U.S. and other governments officially advising people to limit fat consumption, there must be a long history of compelling randomized, controlled trials conclusively demonstrating the dangers of fat. Wrong! A recent meta-analysis concludes there was no evidence from randomized, controlled trials—meaning, an experiment that was actually performed to test a hypothesis—supporting the 1977 adoption of national U.S. dietary guidelines suggesting the limitation of fat.
