Not entirely sure when the change was made, but it doesn't. (It shows up in the Item Manager as growing from 0 adv/full to 1 adv/full to 2 adv/full etc.)
Code:
Casting Song of the Glorious Lunch 1 times...
You acquire an effect: Song of the Glorious Lunch (duration: 5 Adventures)
Song of the Glorious Lunch was successfully cast.
Casting Song of the Glorious Lunch 1 times...
You acquire an effect: Song of the Glorious Lunch (duration: 5 Adventures)
Song of the Glorious Lunch was successfully cast.
> effects song
0 of 3 AT buffs active.
Song of Glorious Lunch (10)
> eat steel las
You gain 5 Fullness
You learned a new skill: Stomach of Steel
You learned a new skill: Stomach of Steel
>eat moon pie
You gain 38 Adventures
You gain 28 Muscleboundness
You gain 27 Mysteriousness
You gain 24 Cheek
You gain 5 Fullness
You lose some of an effect: Song of the Glorious Lunch
> effects song
0 of 3 AT buffs active.
Song of Glorious Lunch (5)