The diets I've seen described all sound like fairly old-fashioned diets. None of them seem to suggest foods that would be novel in any areas - what, fish are novel? Fruits and vegetables? Smaller portions and regular exercise?
Your categories are rather broad. "Fish" are not going to be novel anywhere, but "Atlantic cod" might be. Likewise, by "fruit" do you mean apples, oranges, or some African fruit that's completely obscure in the West because nobody's figured out how to commercialise it yet?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.