YSK: Ordinary white mushrooms are amazing sources of vitamin D and protein in your diet and cost next to nothing. If you're cooking with ground meat, you can mix in chopped/processed mushrooms to cheaply increase the size of your meal without changing the taste.
from /r/YouShouldKnow
YSK：普通的白蘑菇是你飲食中維生素D和蛋白質的驚人來源，而且幾乎不花錢。如果你正在用碎肉做飯，你可以在切碎/加工過的蘑菇中混合，以便宜的方式增加你的飯量，而不改變味道。