This week's health news:
https://www.npr.org/sections/health-shots/2019/01/14/684118974/from-couch-potato-to-fitness-buff-how-i-learned-to-love-exercise
https://medicalxpress.com/news/2019-01-vitamin-d-supplements-benefit-70s.html
https://www.wired.com/story/bio-printers-are-churning-out-living-fixes-to-broken-spines/
https://www.newsweek.com/score-who-point-high-fiber-vs-low-carb-diets-1289141