Limiting fat and protein in favor of carbs in one’s diet is a good example. This bad advice lead to an obesity epidemic that has killed millions of people.
As it stands, I am very skeptical that you could find any such evidence.
The way to change consensus is evidence-based advocacy by experts, not idle speculation by the domain-uneducated.
Without the discussion many of the topis scientist study and figure out the truth would never have happened.
We need the conversations and even controversy help decide where we spend the resource of what scientist study.
edit: gatekeeping
The funding to eventually overturn this bad science was suppressed at mainstream institutions and had to be obtained from the very outsiders you condemn. Phrenology and scientific racism were embraved by the experts for decades. Lucky for us, people didn't follow your advice then.
Notwithstanding the merits or lack thereof of your point, the videos about chloroquine and ivermectin that were banned WERE discussions by medical professionals. Have you seen them?
Its completely true based on my FB or twitter feed where you can find thousands of people who couldn't pass a GED test arguing a bout science that they don't understand.
Yikes. I can only imagine how little progress we would have made as a civilization with an a approach like that.
Also worth noting hiding behind "just discussing" something is a slippery slope in its own right. There's a long history of people claiming to be "just asking questions" when they're transparently using "discussion" as a means to spread fringe ideology.