Wow! I didn't know this:

We did read the other day that if you place mushrooms in the sun, they absorb phenomenal amounts of Vitamin D which in turn can be absorbed through consumption.

Amazing stuff... I didn't get into the books about it, but I had some real-life examples... Had a friend that didn't get out of the house for months... And then decided to go to work in Italy at Olives plantation... He literally, has almost died there because of the body shock to the "fresh air" and a radical way of living until that moment...

On the other side, all those months spent in the house he was sick from something, without strength, etc...