Tracy: He was crippled, but only his body was cracked. It's not simple, nor is it an easy matter to explain. "Let's just leave it at that," she says and closes the holy book of lies. She covers her eyes, denying to herself what she thought happened.
Tracy: Mom, I have to go to the bathroom now.
Melanie: Can't you hold it a minute?
Tracy: That's how you get a bladder infection, you child abuser.
Melanie: That's dramatic.
Tracy: Mothers, lock up your sons.
Tracy: Geez, Mom, why don't you open a hotel? You could get paid for all this shit.
Melanie: I want you here with me. You're my heart. I'll make it right.
Answer: I think what started it was her tongue piercing. She didn't want to eat cause it would hurt and her mom would notice.
I think it's a combination of the tongue piercing and Tracy's new rebellious attitude. She wants to be "difficult" by refusing to eat what her mom cooks. Evie, meanwhile, is trying to impress Tracy's family, because she wants to live there for as long as possible. So she eats whatever food Tracy's mom cooks.
Drugs will affect your appetite.