Plenty of news about deficiency of vitamin D in children these days and plenty of advice on how to get it from foods like fish and milk or supplements. But did you know that UV light zapped mushrooms are full of vitamin D? UV light from the sun is what makes vitamin D in our own skin. This is a great way to enhance the vitamin D content of mushrooms without any additives. Mushrooms are also a good source of vitamin B, iron, protein and fiber.
This is good news for those who may be allergic to fish or dairy, or simply want to look for more options before getting on the vitamin D supplements bandwagon. The US Department of Agriculture has been actively developing a method to treat common mushrooms (white, portobello etc.) with help from Monterey Mushrooms, a large national-level producers of fresh mushrooms. Although, we have not stumbled upon it in our local store, they now have the Sun Bella brand UV-treated mushrooms available in major supermarkets nationwide.
There is another competing method of treating mushrooms using high energy flashes of UV light. This patent-pending method has been developed by the Xenon Corporation and used by Dole in treating their portobello mushrooms. I am sure they will soon hit the store shelves all over if not already there.
The reason it works is that mushrooms contain a sterol (a class of chemical compounds, for example cholesterol) called ergosterol, which is converted to vitamin D2 (also known as ergocalciferol) when it is exposed to UV light. It appears that a strong focused exposure to UV light is needed for conversion because it does not happen on its own when mushrooms are cultivated.
The other form of vitamin D available from food, especially animal sources, is vitamin D3 (also known as cholecalciferol). Vitamin D3 is more effective than vitamin D2 in raising the blood levels measured in a typical test.
I think this is great news, although I am sure these companies will charge a premium for the vitamin D “enhanced” mushrooms. Look for them in your supermarkets and let me know if you come across any other brands.
Photo source: Wikimedia
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