"I feel so strong when I'm not eating and I feel success and such power and such control when I'm not feeding my body," she said. "I get a hollow sense in my stomach where I feel really thin and that feels good."
Chloe said she began carrying a food scale with her, weighing every bite she ate. She would eat two pounds of vegetables a day and consumed so many carrots that her skin turned orange.
As part of their treatment, Renfrew patients have to eat what are called their "fear foods," and each patient has a long list of foods they are terrified to eat.
"My fear food would be chocolate milk," Taylor said. "Dessert, ice cream in particular, pasta, fries, really anything I considered as bad food, which they teach you that there is no such thing as bad food. But really processed foods, stuff like that. Crackers, those would be my binging foods that I would go on and purge those."
Each meal is monitored by a therapist and must be eaten within an hour. Taylor battled with her anxiety when she was served spaghetti.
"My chest is tight, my stomach just feels very full," she said. "I feel like I want to cry. I'm trying to control my breathing or else I'll start hyperventilating, but sometimes when I feel this full it leads to a panic attacks."
So much of EDNOS is secretive, and Taylor said she had always eaten her meals in isolation before her diagnosis. But after meals, patients have meal-support group therapy sessions to talk about how they are feeling.
As her treatment progressed, Taylor said she began to start to "taste food" for the first time, but still broke down several times and cried at meals. Six weeks after she struggled to eat pasta, Taylor was presented with pizza as a "challenge meal" since it included one her fear foods. After cleaning her plate -- which is the goal at Renfrew -- she told the therapist eating her meal was still very hard.
"Physically, I'm probably an 8 [on a scale of 1 to 10], which is normally a really comfortable place for me to be," she said. "But with my emotions, I didn't have that much anxiety coming into it, but then once I saw [the pizza] all on the plate and then seeing it now [empty], I like I'm over a 10 right now and I don't feel good."
Watch Taylor and Ali as their treatment progresses at The Renfrew Center on "Nightline" TONIGHT at 11:35 p.m. ET