Difficult in places where there is insufficient sunlight for much of the year!

Basic sunlamps aren't expensive. I grow plants in-doors and suppliment w/ them, the bulbs are ~10-15 bucks and fit in any desk or ceiling lamp.

I have a "happy lamp" by a reading chair in my living room, and sit under it in the mornings while drinking coffee and watching the news. Coffee+Sun perks me up in the morning right quick.

I'm in Edmonton, Canada -- look it up on a map, we're far up there -- and it's basically how I make it through the winters here.

So these are UV bulbs? I know bright light is used to combat SAD, but AFAIK that's not about vitamin D, just the light itself having an effect on mood.

i was mainly joking because I think that most of the times when we peal back the layers of research we see that natural systems have adapted over time for certain reasons. Also there should be further research into how native people in northern climates adapt to low sunlight conditions given their location. Perhaps there are areas of the diet we are overlooking instead of just prescribing vit D as the only fix