Other (new) studies and meta-studies do, however. And contradict what you wrote.
E.g.
http://annals.org/aim/article-abstract/1846638/association-d...
>Trying to divide foods into healthy and unhealthy is impossible.
They don't try to "divide foods into healthy and unhealthy". They try to divide diets of food, including amounts and limits, into healthy and unhealthy.