People north of Colorado don’t have access to enough sun, especially in winter...
Then a shot of milk every 6 to 8 hours. Does a tanning bed work I wonder.
So it is a sunshine access problem. Well, we can set up a program to transport sunshine north during the winter months. Just need congressional authorization and about a $90 billion budget and I think we will remedy the problem. If it does not completely fix it we can continue the program as long as necessary (and with a growing budget).
In addition to taking D, go out at the midday hours, leaving as much skin exposed as possible and staying as long as you can.