It seems like these kinds of "studies" are only made to write headlines and to write books (notice how half of the people quoted in the article have some surprising new "facts" that they reveal in a book they wrote?).

The only paradox is why researchers still latch onto a calculation of health based on just height and weight that was concocted in over 150 years ago. What other field would rely on such a primitive, outdated formula and use it as the base of research?