This movie changed my life in ways absolutely unexplainable… I can’t even think of where to begin. I’ve mentioned a lot of areas where Ratatouille has changed my life in this post over in the Votre Critique de Ratatouille thread, however. 
little chef
Here is something I wrote on a previous post:
Ratatouille not only fueled my love for Pixar, but also my love for cooking. After watching the movie, I became interested in cookie and joined cooking classes at my High School, and now I’m in Culinary Arts. Cooking is now a passion of mine, right alongside drawing and gardening.
Well, this movie didn’t really change my life that much, I saw it and thought it was really good, but not much else. It did however cause me to start noticing Pixar, and I became an official fan after seeing Wall-E, so in a way, Ratatouille made me want to see Wall-E, which did change my life extremely, so in a way, Ratatouille set me on the right path. I always thought it was a really good movie though.
I suppose it’s safe to say that, had it not been for this film, I probably wouldn’t have been half as determined to secure a position at Pixar… or be half as confident in myself, on the whole. This film has changed my life more than I can say, and I’m truly convinced that its creation was not a coincidence…
– Mitch
I want a pet rat named Remy now. Also, I have a lot more respect for life. 
Like several other people here, I wouldn’t have been even half as interested in (or good at) cooking if it weren’t for this marvelous film.
The soundtrack has become regular background music in my kitchen, which is of course decorated with several Ratatouille posters.
Ratatouille is a great film - I like it because I do like to cook and have previously read such books as Kitchen Confidential by Anthony Bourdain and watch the Food Network. So I’ve got a rough idea of what it’s like in professional restaurant kitchens.
While I’ve enjoyed Ratatouille enormously, I wouldn’t say it has changed my life, but enriched it. One of my favorite parts of the film has influenced my life and my son’s life. It’s really small, but funny. It’s the scene where Remy is trying to teach Emile how to appreciate the mixture of tastes between cheese and fruit and Emile starts stuffing it in his face. Remy exclaims, “Don’t just HORK it down!”
That word is so funny and descriptive that I use that phrase whenever I can and I always think of Ratatouille when I say it. 
I like to think it made me a better cook, at home I never really cooked all that much but now I live at Uni on my own I’ve found I actually know a lot more about cooking than I thought, so I like to think Ratatouille helped in that.
It definitely made me more interested in cooking and fine dining. Also to follow one’s dreams.
The Pixar team sure can make delicious looking animated food! 
Before Ratatouille came out, I was already a rat fancier with a strong interest in cooking, but seeing this movie provided me with even more fuel for those affections. Plus, it gave me a whole new movie and a whole new set of characters to utterly adore, and to watch and experience time and time again. And nothing could be more wonderful than that.
In a more negative sense, you could say that it wound up being a massive drain upon my bank account…what with all the Ratatouille merchandise and memorabilia I took to collecting in the years that followed.
Well, it didn’t really change my life, but it made me respect good food and it made me want to learn how to cook again.
Well, my earlier post looks really dumb to me now. I still want a rat named Remy, though. I have more respect for “pests.”
This movie helped fuel my love of cooking. It did not, however, make me a better cook 
Pretty much the only foods I can make successfully are Mr. Noodle and toast, but that doesn’t stop me from trying. It also (in part) helped me decide to get a pet rat. They really are playful, and very intelligent.
Ratatouille taught me that not every Pixar film can be golden.
Awww. Rats are sweet companions. 
They are! But my friends don’t believe me. It’s a popular joke amongst them that I found him in the sewer
Yeah, your friends sound a bit like my brother - he’s never even met my rats, but he thinks I’m strange for keeping them as pets. I don’t come from a hugely rat-fancying family, unfortunately - though I think my dad is finally starting to warm up to them.
When I first mentioned wanting a rat, my mom was a bit shocked, but open to the idea: “As long as I don’t have to touch it” she said. Now her, my step-dad, and the rest of my family actually like him, especially my little sister, although she only sees him once in a while (she lives with my dad). My mom even holds him sometimes 
haven’t been here in a while…
I have to say, Ratatouille changed my life because of the character of Colette.
I saw so much of myself in her, both elements of what I was and of what I wanted to be. She inspired me to write her back story. That initial step into the fanfiction world was what got me started in creative writing. Now I’ve written a whole novel with my own original characters and I’m working on another one.
So, Ratatouille changed my life because it inspired me to write, thus introducing me to a form of art through which to express my creativity.
S
Ratatouille made me feel even more compassionate and bad for rats
It also made me see the life of a chef is no picnic. Chefs are hard working people.