Comment by wintermutestwin

>a pretty good source of protein.

Unlike many things that are referred to as a "good source of protein," mushrooms have a really great macronutrient profile:

100g of common button mushrooms = 3g protein, 3.3g carb, .3g fat

Compared to Lentils (which are the best of the standard foods labeled as "good source of protein") 100g = 9g protein, 20g carb,.4g fat.

The problem with lentils is that you have to eat a lot of carbs to get protein. The ratios are terrible for most other legumes, soybeans and nuts.