This has happened before. There was old science on natural remedies, new science (paid by rockefeller) showed that it was all superstition. New science has started or killed several diet fads: tea and coffee bad, milk good, chocolate bad, cholestrol bad, chocolate good, tea good, milk bad, coffee good, etc.
Never forget that 19th and 20th century scientists were already fully valid scientists, most books were much more carefully peer-reviewed (and edited) that today's books and less carefully politicized.
This has happened before. There was old science on natural remedies, new science (paid by rockefeller) showed that it was all superstition. New science has started or killed several diet fads: tea and coffee bad, milk good, chocolate bad, cholestrol bad, chocolate good, tea good, milk bad, coffee good, etc.
Never forget that 19th and 20th century scientists were already fully valid scientists, most books were much more carefully peer-reviewed (and edited) that today's books and less carefully politicized.
Salt too