[Retric]

Doctors learn the results of science, but generally aren’t scientists. People doing science outreach are generally in that same category where their knowledgeable, but speak outside their specialty. Simply because being able to do original research today means a very narrow focus.

Beyond that, the best available information isn’t always that clear. Low salt diets for example where prompted based on very limited information that suggested they where slightly more likely to be useful than pointless. Unfortunately, we rarely have unambiguous data which gives clear guidance. Vitamin C for example is mandatory, but you can have zero vitamin C for 2 weeks without issue or quickly excrete excess. For more subtle interactions it’s just difficult to figure out what’s going on.