Twilight strode out of her library home into the bright, sunlit day. As soon as she was clear of her door frame, her wings unfurled from her sides. Twilight gave a strong down flap and launched herself into the pristine morning air. Twilight's face bore a huge smile as she flew. Still new to the act of flying, it had not yet lost its novelty. Yet, at the same time, the feelings Rainbow Dash described when she flew were growing in Twilight. It was the feeling of absolute freedom, the thrill of every movement in the air. Twilight enjoyed every minute of her flight.
Her joy did not last, for as soon as she touched the ground outside Fluttershy's cottage, the grim nature of her task returned to the front of her mind. Twilight thought, 'I'm about to ask the most innocent pony I know where she gets her meat. I'm about to lie to her when she asks why I need to know. I'm so glad that I'm not AJ. She could never do this. Here goes nothing.' Twilight's hoof rapped four times against her friend's door.
A moment later, the door cracked open. Down on the ground stood a small white bunny. "Oh, hello, Angel. Is Fluttershy in? I need to ask her something," she explained to the bunny. Angel nodded and opened the door wider to accommodate the alicorn. She accepted his invitation to enter. Angel led Twilight into the kitchen, where Fluttershy sat drinking her morning tea.
The yellow pegasus noticed her friend and softly exclaimed, "Oh, hi, Twilight. I'm sorry, I didn't know that you were coming over. If I had, I would have made you some tea..."
"Oh, no problem, Fluttershy. I came here on an impulse," Twilight said.
Fluttershy tilted her head. "Impulse?"
Twilight continued, "Yeah, I thought of something I wanted to ask you."
"Yes?" Fluttershy asked after a minute without hearing Twilight's question. "Umm... Twilight, what did you want to ask?"
"I, ummm... wondered where you got the meat you feed your carnivorous animals. Owlowiscious usually hunts for himself, so I've never thought about it before. But where do you get the meat for them?" Twilight asked her friend.
"Oh, umm... There's a merchant who comes to town every three days. He sells fish to ponies with pets. I think Rarity's dad, Magnum, fishes too. Those are the ones I usually get the food for my critters. Does that help?" Fluttershy asked.
"Yes, thank you, Fluttershy. That answered my question. I'll see you later, okay?"
####################################################################################
Twilight acquired salmon without any difficulty. The merchant didn't even ask why she needed it. Twilight thought he gave her an odd look, but it was probably just her paranoia making her see things. However, since no questions were asked, Twilight made it home without incident.
Now her only problem was Spike. She couldn't have him in the library while she was eating. Granted, the little dragon COULD eat meat, but he never had.
'Actually, Spike might very well have tried it behind my back. If he has, I'll be upset that he didn't tell me. But he's a mature kid. I won't be upset with him for eating meat. I would be a hypocrite,' Twilight thought to herself.
Fortunately, Spike himself presented the solution to her problem. "Twi, I finished my chores. Can I go dig for gems with Rarity?" the dragon asked.
"Oh, sure!" Twilight smiled. "Go spend the day with her. Have fun, Casanova!"
Spike blushed at the mention of his long-time crush. Thanking his caretaker, Spike dashed out of the library at a speed that would make Rainbow Dash envious. Twilight chuckled at her assistant's antics.
Now that she had the library to herself, she set to work. First, before she did anything with the food, she grabbed a quill and some paper. On it, she wrote 'Library closed for scientific experiment. Do not disturb. That means you, Rainbow Dash and Pinkie Pie.' Twilight tacked the notice to her front door. She then went around her library, closing the windows and drawing the curtains closed.
As one final protection, she enveloped her home in a force field. She tuned the strength of the force field so that it would be a barrier to the average pony, but would break in case of emergency.
Finally satisfied that she wouldn't be interrupted, she reached for the cookbook that she had left on the table that morning. Flipping through the pages, she stopped at a recipe that looked interesting. "Citrus salmon... I have all of these ingredients. Yes, I'll do this one," the alicorn muttered to herself.
####################################################################################
An hour and a half later, the steaming dish sat on her plate. Twilight felt guilty that it smelled good to her. Her stomach rumbled in agreement. She levitated her fork to her plate and scooped up a chunk of the flaky meat. The texture surprised her, although she really had no idea what she was expecting. The fork slowly levitated up to her mouth. She gulped, 'This is it. No turning back now.' The fork entered her mouth and she bit down. A strange flavor filled her mouth. She could identify all of the other ingredients, but the fish itself was something totally new to her. She'd done it. Twilight Sparkle had consumed the flesh of an animal. The worst part of the whole experience was when Twilight realized that she had already taken a second bite.
'Oh, Celestia... This is good. There's no way this should taste this good. I'm eating FISH!' she thought. For some reason, the guilt she expected to come never did. Her fork returned to her plate again.
And again.
And again.
And again.
Soon, the entire fish had been consumed. The alicorn happily patted her stomach, very satisfied with her meal.
She made a mental note to document the experience later. For now, she had to clean up the unused fish.
As she cleaned, Twilight contemplated the perverse nature of her experiment. It was just so delightfully devious. It would be her little secret, her one blemish on her otherwise flawless record. And everypony else will be none the wiser. Twilight thought, 'I will have to do that again. Maybe I should try something else next time. Perhaps chicken?'
####################################################################################
Once the library was back in working order and there was no evidence to indicate anything out of the ordinary had happened her, Twilight opened the library back up. Dash was waiting patiently outside. When the pegasus noticed that the building was open, she charged Twilight. "Ugh… What took you so long in there! I’ve been waiting like, for 20 minutes! Come on! Hey, is the new Daring Do book in yet?"
'Oh Dashie... '
Vomit? Horses can't vomit, except maybe Pinkie Pie....

2577406
15:10 in applebuck season: berry punch vomits into bucket because of
's baked bads. 
http://www.dailymotion.com/video/xksr33_my-little-pony-friendship-is-magic-1x04-applebuck-season-720p-web-dl-dd5-1-h-264-etp_shortfilms&start=900
I can already tell how this going to go. Twilight will slowly begin to eat more and more meat, until she's frantically trying to hide her "addiction" from everypony, then at the end, it'll be revealed that everypony eats meat and it's just a social taboo no one talks about.
EDIT: Oh, didn't see the author's notes. In that case, Twilight will be consumed by her carnivorous desires and attempt to cannibalize one of her friends in the most hilarious manner possible before going completely insane and unleashing a spell that makes everypony meat eaters and turns Equestria into some kind of [Grimdark] meat paradise.
Oh my

....where is this going
Nice story, although it would be nicer if you didn't tell us what what was coming in future chapters with the author's notes. I like to be pleasantly surprised. Anyway, I'm looking forward to seeing where this goes.
2579073
I actually DID think of both of those story directions......
Whoopse. No spoilers....
Please continue.
2579073
Actually there are already at least two fics on the site where ponies eat meat.
1. Unnatural Selection (Alternate history, Ponies are the apex predators and eat everyone)
2. To Serve Bronies (guess who they want to eat in that one)
Like where this is going. Always love fics which use Twilight ingrained use of the scientific method to justify odd behaviors. Mmmm. roast chicken.
2586649
This is in the cannon universe where ponies are STRICT herbivores. The one exception is eggs, usually in baked goods.
2586690
What about gelatin? Traditionally gelatin is derived from pigs. We've seen marshmallows and other gelatin based desserts in the show.
Man, that roast beef sandwich, Twilight is going eventually crave, is going to be uncomfortable with talking cows running around.
Though, i don't think her friends will mind that much. Rainbow will eat meat if you challenge her to. Pinkie may be insane enough to have already done it.
2586716
I have wondered about the gelatin. And Discord's gravy...
Ahhh yes, the cows....
twilight and pinkie WILL eat Dashie cupcakes.
Well, there is a popular headcannon that pegasi of the past hunted for and consumed fish. Though this was the limit of their carnivorous cravings, I am curious to see whether Twilight's accession has had any effect on her digestive system and taste buds. Maybe we can get Celestia up in all this action?
Ponies would NOT vomit, since horses CAN'T vomit... Not this world's ones, as we've seen MLP ponies puking after Apple Jack's cupcakes (with worm meat inside!)
Knowing Gilda will appear makes this story so much more worth reading, and its an excellent story so far, the Griffins have so much to explain to us
That sign wouldn't work, Rainbow Dash uses the window and Pinkie uses illegal gypsy magic
Pinkie is not your average pony.
2694341
Unfertalized eggs could be considered a by-product, like milk, since they won't hatch, and will ultimately just start to smell bad.
i.chzbgr.com/maxW500/7834006016/h9022FC8F/
Ha! Scota-chicken joke!
If Twi enjoying meat isn't part of her alicorn make up, maybe it's a by product from being human at one point. What? It could happen.
I expect that she'll like this new Twilight a lot!