Yes, the D data is incomplete and mostly done in sunny climates, the reference range for vitamin D in blood is also based in iirc Spain or that climate, so it might be that slightly defficient in colder climates is a-ok. Plus it is hard to separate bogus claims when it comes to D, since people want to implicate it in everything from immune compromise to why your nanas cookies don’t taste too good.
That said, 5 minutes out in direct sun is probably a fair recommendation because most people will likely spend more than 5 minutes out if they have made it there. I think the recommendation is more about the climate / weather conditions rather than “take off your clothes for 5 mins in the winter”. If you have to go out more covered (i.e. long sleeves, pants) for the majority of a month, you will want to supplement. If you are unsure can always check serum levels.
Personally I take more than 1k IU, but I will stick to official recommendations when giving advice.
Yes, the D data is incomplete and mostly done in sunny climates, the reference range for vitamin D in blood is also based in iirc Spain or that climate, so it might be that slightly defficient in colder climates is a-ok. Plus it is hard to separate bogus claims when it comes to D, since people want to implicate it in everything from immune compromise to why your nanas cookies don’t taste too good.
That said, 5 minutes out in direct sun is probably a fair recommendation because most people will likely spend more than 5 minutes out if they have made it there. I think the recommendation is more about the climate / weather conditions rather than “take off your clothes for 5 mins in the winter”. If you have to go out more covered (i.e. long sleeves, pants) for the majority of a month, you will want to supplement. If you are unsure can always check serum levels.
Personally I take more than 1k IU, but I will stick to official recommendations when giving advice.