I watched this programme last night about food, with Professor Alice Roberts.
Apparently if you put mushrooms out in the summer sunshine for just 1 hour a chemical reaction occurs and the mushroom is flooded with vitD. It can not be destroyed by putting the mushrooms in the fridge or cooking.
Great news for vegetarians in particular. So get out in your garden folks with your mushrooms before you cook them.
I think it’s fascinating Lol