[justin66]

> Natural simply means 'existing in nature'

It took me 15 seconds to find a dictionary entry with seven different definitions for the word. But thank you for your valuable contribution.

> But implying that something that is natural (ie, not borne of human activity, per your usage) is by definition good is fallacy.

But as a heuristic it's probably not terrible. The paleo diet people have some strange ideas but the diet itself is really not bad. Veganism as a heart healthy diet is playing out well for a lot of people. And so on.