What I'm about to say is not controversial from the point of view of nutrition scientists: healthy eating primarily consists in eating whole grains and starchy vegetables, pulses and other seeds, green leafy vegetables, and the flesh of tender fruits and vegetables.
This idea has had substantial scientific evidence underpinning it for about 80 years at this time, but the idea itself has been proposed numerous times in writing over hundreds of years.
As has its opposite: that diets that consist mostly of foods made of animal flesh are the most healthful. In the place of scientific evidence, this belief centers a mistrust of the establishment as its philosophical underpinning. Salesmanship considerations are all on its side: people want to believe that it's true. It provides a strut to support their existing habits with and lets them identify with a group of people they see as aspirational, namely the hunters of the hunter-gatherer ancestors.
National humiliation Robert F. Kennedy Jr., the Secretary of Health and Human Services under the humiliating Trump regime, has made his own body a tribute to this absurd idea. The 72-year-old Kennedy, who recently gave a hearing in Congress during which his labored breathing could be heard through his microphone while not speaking, has claimed that his idea of good food for a Super Bowl party would be "meat and ferments." In a promotional video he published (apparently on purpose), he and has-been white trash rock rapper Kid Rock got sweaty in RFK's exercise room before enjoying a cold refreshing glass of whole milk while sitting together in the hot tub.
This paragon of health in human form (not to mention sound decision making and relatable life experience) very quickly published a new food pyramid that, like most national food guides, is poorly designed. Unlike most national food guides, it also aims to distort the scientific consensus by placing "meat and ferments" close to the top of the food pyramid.