After the 1984 NIH Consensus Conference on Cholesterol, one of the scientists involved stated that "if there are truly been a consensus, there would have been no need for a conference".
Still, there were large profits to be made in convincing people to use statins and to eat low-fat food. So they stacked the panel, and reached their predetermined conclusion, and with the connivance of a willing popular media, doomed millions to lives of misery, obesity, and illness.
It was, in my mind, the single greatest mistake in human history.
Because we let a government committee declare a "consensus".