The street wisdom was that eggs gave you high cholesterol due to the yolk having loads of cholesterol (which doesn't get absorbed, we need to produce our own cholesterol).
There were a bunch of studies saying high cholesterol was bad and would give you a heart attack. Then also ones saying low cholesterol would make you crazy [https://pmc.ncbi.nlm.nih.gov/articles/PMC4215473/].
And also ones saying food high in cholesterol was bad. Then ones saying food high in ‘bad’ cholesterol were bad, and one’s high in ‘good’ cholesterol were good.
Then eventually we figured out that dietary cholesterol has almost no impact on blood cholesterol levels except in a tiny portion of the population.
