"So. This is what you call 'normal'? Barely eating anything?"

"Well, yeah. I mean, who would want a fat Pegasus?"

"Rainbow Dash. You. Are not 'Fat'. You're far from it."

"You can never be too thin."

"Why do you think like that?"

"Well.. my parents were always going on about dieting, how we had to look, stuff like that, ya know?"

"So.. basically you think that you have to be thin so your parents would.. like you?"

Dash thought for a second.

"Hm I guess."

Twilight, taking notes of everything, came to a conclusion.

"Rainbow. I want you to look in the mirror" She levitated a body mirror in front of the two, "and tell me what you see."

Dash did as she was told. She could see herself, but could also see Twilight in the reflection.
She didn't like how she looked. She looked like the exact opposite of what she wanted to be.
Fat. Ugly. Worthless. Pathetic.
Compared to Twilight, she looked like she was two years pregnant with twins.

"Why would you call me 'thin' if I look like... THAT?!" She snapped at Twilight.

"Rainbow, listen. What you see is a trick."

Dash continued to glare at the alicorn.

"Your mind is playing a game with you. No matter how thin you are, you will always think that you're overweight."

"That's bullshit and you know it Twi."

"I'm serious. Rainbow Dash, I'm pretty sure that you have an eating disorder."

"Come on! Out of all the uncool things, you accuse Me to be a loony?!"

Twilight gasped.

"Rainbow! Eating disorders are serious diseases! Most end deadly if not treated!"

"Oh please. What could be so deadly about wanting to lose a bit of weight?"

"Losing a bit. And more. And even more. Until only skin and bones are left. Ever heard of starvation? That's what happens! I don't want you to starve yourself to death! Why won't you understand?!"

"Because I. Don't. Have. A. Disorder."

"Rainbow. Come with me to the kitchen. And eat whatever you want."

"Fine. If that's what it takes for you to believe me."

She got up on her wobbly legs, still not having enough strength. Twilight rushed to her side as she fell to her knees.

"I don't need your help." Dash argued.

"Of course not." Twilight said ironically.

She helped the Pegasus to the kitchen.

"So, what do you want? Pancakes? Muesli?"

"How about some healthy food?"

"Like what?"

"Apples? Carrots?"

"Alright." She levitated both vegetables to the Pegasus.

Dash only stared at them, so Twilight tried to push her a little.

"Go ahead."

She wanted to prove Twilight wrong. But something in her mind told her 'no'. It was too early for food.

Twilight wouldn't win this though. Dash grabbed the carrot and began the fight.
Twilight watched a bit relieved as Dash practically inhaled it like a dog.

But it just wouldn't last long. Just as Rainbow tried to swallow it, her body rejected it. It was her body's last attempt at making things right.

A few painful heaves and the floor before her was covered in orange pieces.
Twilight gave her a sympathetic look and gently rubbed her back.

Rainbow just closed her eyes, ears flat. She was ashamed for losing against her friend. But she was even more ashamed that her friend was right.

She did have a problem.

She had in fact an eating disorder.