alt Hacker News> severe VDD was defined as serum 25(OH)D levels of <25 nmol/L, moderate deficiency as 25–50 nmol/L, insufficiency as 50–75 nmol/L, and sufficiency as >75 nmol/L.
These numbers seem high to me. The 75 nmol/L (30ng/L) is not really a reliable value. It was published in a research that raises many questions due to conflict of interests.
Hence the
> ~40% of people don't get enough vitamin D
becomes:
> ~40% of people in the USA don't get enough vitamin D according to Dr. Holick
Where I live the norm is 20 ng/L and if we apply that, then the shocking 40% becomes more reasonable 10-15%
> Where I live the norm is 20 ng/L
How did they come to this?
Seems like a reasonable measure would be to look at a native person, from ones lineage, having a relatively average pre-industrial day.
If lineage doesn't matter, and all humans are the same, you could probably just go sample some tribe members that still lives mostly outdoors, outside of developed society.
And, regardless, I'll listen to my doctor.