Well, the standard example is nutrition advice. Other reasonably well-known examples include whether post-menopausal women should take estrogen supplements, and how dangerous marijuana is. An example with a longer period is the whole issue with eugenics.
whether post-menopausal women should take estrogen supplements, and how dangerous marijuana is
How many times has the academic consensus on those reversed, and does that match your original claim that for these century-plus old fields like medicine,
the fact that this consensus itself nearly reverses every couple decades is rarely brought up
?
EDIT: feel free to reply to my challenge any time, Eugine.
Here's another installment of rationality quotes. The usual rules apply: