I just found this gem from the Alaska Legislature 2015. Rep. Paul Seaton chairs a vitamin D discussion. Natives used to dry Salmon under the sun, greatly increasing vitamin D. Now their vitamin D levels are way down, since most eat a western diet in addition to no longer using this traditional drying technique.
The vitamin D discussion is on overcoming Rickets, which only requires 20 ng/ml blood levels, whereas immune health (as for Covid) requires 50 ng/ml.
Video of the Alaska State Legislature
03/12/2015 03:00 PM HEALTH & SOCIAL SERVICES
56:15 Rep. Paul Seaton, Chair says they lowered the preterm delivery rate to 7% through a vitamin D program called “Protect Our Children Now.”
1:17:30 Vitamin D presentation by JAY BUTLER, MD, Chief Medical Officer/Director Division of Public Health
133:30 Alaska State Rep. Paul Seaton explains how Alaska Natives traditionally dried Salmon, marine and land animal meats in the sun, which greatly increased their vitamin D levels.