This is a red herring argument. You don't need iron-clad evidence of a diet better than all diets. You only need iron-clad evidence for smaller specific recomme

This is a red herring argument. You don't need iron-clad evidence of a diet better than all diets. You only need iron-clad evidence for smaller specific recommendations. This doesn't have to be an all or nothing diet. In fact with nutrition it probably can't which means advice should be both well-researched and more nuanced than it currently is. Neither of which changes the point that making recommendation with little to no quality research is more likely to make it worse than make it better and you'd be better off just staying where you are until you understand the problem better.