"Mpphh - mphhh - God..." Rachel mutters through a partially-filled mouth as she notices herself ballooning. Part of her is terribly upset over this.
The rest of her is in the thralls of whatever it is that's causing her to grow. She's caught in the ravages of her unnatural hunger, and begins indiscriminately tearing through the refrigerator. Raw, cooked, expired, it doesn't really matter, all she cares about is filling this growing need inside her expanding belly.
And so she gets bigger. Her buttocks strain against her sweatpants, her bulging breasts fighting to tear out of the now-restrictive t-shirt she is wearing, and let's not even talk about her thighs and arms.