A fad diet is one that advocates for the elimination of entire real food sources, whether that's dairy, grains, nightshades, legumes, vegetables, meat, whatever it is.
The burden of proof is not on why you should eat from a real food source, the burden of proof is on why you shouldn't eat from a real food source.
When authorities defend these fads, there's often an identification of a biochemical. And the authority then vilifies that particular biochemical.
Because they're using terms that very few people understand, they're achieving an illusion of authority through the confusion.
Authorities then use these biochemicals as justification for eliminating entire food sources. When in reality, these biochemicals, when consumed in moderation, are usually fine for the vast majority of humans.
