The article did not point out to other details of their research like: 1. Do the Tsimane people consume or have access to processed foods? 2. Vaccinations? 3. Any access to pharmaceutical products?

It also mentioned on the article:

"The scientists scanned 705 people's hearts in a CT scanner after teaming up with a research group scanning mummified bodies."

If they performed the test on mummified bodies, how were they able to determine the amount of CAC at the age of 45 and again at the age of 75?

I wonder if they also performed some tests for those people who are still alive?