I think I've eaten , at least , 107 brown mushrooms and about 12 red mushrooms (Because I didn't know what they did) during the course of my travels in Survival Mode.
Here is some information on these mushrooms:
Brown Mushrooms: Brown ones heal about 2 and a 1/2 hearts of health. Found in caves.
Red Mushrooms: Red ones damage you for about 2 and a 1/2 hearts of health. Also found in caves.
I haven't eaten any shrooms in survival, because I dislike survival very much. I just did creative for a while, then I decided to buy Minecraft, then I played Indev, then Infdev. I should try Survival sometime.
Here is some information on these mushrooms:
Brown Mushrooms: Brown ones heal about 2 and a 1/2 hearts of health. Found in caves.
Red Mushrooms: Red ones damage you for about 2 and a 1/2 hearts of health. Also found in caves.
****!
You heard that, green and red.