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Most forms of medical advice, some of it stuck around for a long ass time (bloodletting and the idea of spirits and humors lasted several millennia), but I imagine that the vast majority of it is lost to time.
You don't even have to go all that far back to see this in action.
In the 90's, the universal medical advice was to avoid fats, sauces and dear lord never eat more than 2-3 eggs in a week or you'll have a coronary before 40.
You still shouldn't go overboard with fats and sauce which is made with fat, but the advice that you shouldn't eat more than 2-3 eggs in a week is entirely defunct now.
You can eat 2-3 eggs a day (which many people do without even knowing as eggs are used in a whole lot of things) without any medical disadvantages.
The problem now is studies saying fat is bad are sometimes studying vegetable oil, and then saying all fat is bad.
It's USUALLY not the studies or scientists themselves that do that, it's shitty 'science' reporting from media outlets.
No the studies say it.
Study design also plays a role in how risk is measured and presented (see transcripts at these links): https://nutritionfacts.org/video/how-the-egg-board-designs-misleading-studies/
https://nutritionfacts.org/video/debunking-egg-industry-myths/
https://nutritionfacts.org/video/eggs-and-arterial-function/
A bucket of salt is probably more healthy for you than listening to anything a site with "facts" in the name says.
And that's not even looking at who's behind that site and the wording they use.
Remember, breathing gives you an elevated risk of lungcancer.
How about the WHO? https://www.who.int/news-room/fact-sheets/detail/salt-reduction
After believing Dr. Gregor (the author of that site) for awhile, i don't believe or trust him anymore. He's a vegan and I think he's set on a vegan mission despite him claiming he's not.
The thing with cholesterol is still true though. What matters is, once a lot is fine (body can regulate that) but over a long time it is bad, promotes arteriosclerosis. So, no, the "without any medical disadvantages" bit is not true.
I remember that....a lot of people just looked at the advice given and said "I don't trust people trying to tell me margarine is healthier than butter".