Food AMushroom, common, boiled, microwaved or steamed, drainedServing 100 g (100 g) 1 mushroom (large) (50 g) 1 mushroom (extra large/giant) (109 g) 1 mushroom (medium) (23 g) 1 mushroom (small) (13.2 g) 1 mushroom (very small) (7.9 g) 1 slice (4.6 g)