Should I be eating more mushrooms?

I've tended to view mushrooms as basically sponges for other flavours and something that primarily adds texture to a dish, never thinking about any potential health benefits. Today though I came across 6 Healthy Foods to Fight the Flu, Beat Stress and More, and the first thing on the list was the following:

You want to: Keep colds and the flu at bay
Veggie Rx: Mushrooms
“Many people think mushrooms aren’t as healthy as other vegetables because they’re white,” says Tammy Lakatos Shames. But they’re packed with disease-fighting nutrients, and some are even great sources of vitamin D. Studies have shown that this fat-soluble vitamin may play a role in keeping the immune system strong and there are very few good dietary sources of it. One important note: only certain mushrooms provide this benefit, thanks to being grown under ultraviolet light. Check the package label, or seek out Dole Portobello Mushrooms and Monterey Mushrooms.

Perhaps it's time in make these more than just an on-odd-occasions food and start consuming more of these. I've been meaning to play around a bit with portobello mushrooms so perhaps, given my current cold, now would be a good time.