Actually, doctors have been advised to wash their hands between patients for about a century now. They just don’t do it as much as they should — a constant hassle for all hospitals is getting doctors to actually wash their damn hands.

The main point about dietary guidelines is that they haven’t changed much because the optimal diet was reasonably well understood even in the 70s and 80s. Getting people to eat said diet is the hard part, but the diet itself isn’t that misunderstood.

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