If I can eat so much, why didn't I come with a warning sticker?

This just randomly popped in my mind. I wasn't particularly hungry before lunch time but I ate Mc Happy Meal which consists of 4 pcs nuggets, 1 cup of corn and 1 apple juice.
I am now staring at the small rectangular piece of cake which I bought in the morning - just in case I got hungry again.

I just don't control!
Grrrrrrr.

Do you miss me?
Do I miss you?
Do you think you are who I am referring to?
I 'fraid you are gonna be disappointed for a long while.

-faint-What the heck am I talking about?