You are so right, most folks don't know that nearly all of a fungus consists of thread like structures growing underground (or in a mixture of soil and manure, in the case of cultivated mushrooms). All mushrooms are what is called the 'fruiting body' of the actual fungus. Most mushrooms are delicious (even the poisonous varieties, which is why you have to be careful when you pick wild mushrooms). They are pure protein, without fat, and have many different flavors.
For those who will not find this appetizing, remember what Bismark said, that if you want to enjoy laws or sausages, you should not watch them being made. If you think fungus eating is unlovely, just watch a film made in a slaughterhouse. Me, I love Prime Rib Roast, smothered in Mushrooms!!
"The fungus is now grown through fermentation, mixed with egg and flavorings"
LOL...so you don't eat fat, I guess, but you DO get to load up on all those healthy artificial FLAVORINGS!! YUMMY!! (ack...gag)
And what if you're allergic to eggs?