I think the new part of it is how it's measured now vs how it was measured 10 years ago. The better the medical technology is, the more likely they will revisit things to see the results by testing with the newer technology.
A good example would be how the U.S. took P.E. out of the schools and kids started getting fat. Everyone knew why but it always takes study to "make it real"
Most kids don’t get enough PE time, study finds
It took a study to make many in the medical field and general population to understand that Tai Chi had physical benefits such as increasing bone density. For the longest Yoga and Tai were just things that wimpy people did and contact sports were something that strong people did. But once the study comes out, it changes the mindsets.