When should I switch my MC from kitten food to adult?

Hi, guys! My maine coon kitten, Bruce, is 11 months old now and we just ran out of his kitten food. He has been eating Blue Buffalo Kitten food & the bag recommends cats eat it for one full year.
I wasn't sure if it was really necessary to go for another month or not?--I don't want to deprive my kitten of any fats or proteins he may need for his last month of being an official kitten, but I was also wondering if it's not as necessary to go the whole 12 months as I've been thinking--Some people on another forum [thecatsite.com] said that they only do kitten food for up to 6 months.
I also saw someone [on thecatsite.com] say something about continuing to feed their Maine Coon cat the Kitten Food for 3 years because they continue to grow for up to 5 years.
I'm hoping to get some thoughts from people who really know their facts--or just share the best info you can in order to help me figure it out.
Thank you!

I have always stopped giving my babes kitten food very early on,none of them have been on it until 6mths of age but I do add in extra vitamins until they are about 15 months old,no growth problems or health problems from doing it...... you might just have to get a small amount of kitten food though to help swap over to adult so the shock isn't so bad on the ole tum....xxx

I just switched Buzz and Baxter - they are one year old today!!! :rofl: I always have mixed three brands of dried kitten food in a container so I now have started adding the same brands in adult food. The wet food they are on is also grain and gluten free and is for adults, so no change there. Jckkerrison, what vitamins do you suggest?

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Originally Posted by jckkerrison

I have always stopped giving my babes kitten food very early on,none of them have been on it until 6mths of age but I do add in extra vitamins until they are about 15 months old,no growth problems or health problems from doing it...... you might just have to get a small amount of kitten food though to help swap over to adult so the shock isn't so bad on the ole tum....xxx

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Good to know!!! I should definitely look into vitamins as well. Just as KimAZ said, what vitamins would you recommend?

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Originally Posted by KimAZ

I just switched Buzz and Baxter - they are one year old today!!! :rofl: I always have mixed three brands of dried kitten food in a container so I now have started adding the same brands in adult food. The wet food they are on is also grain and gluten free and is for adults, so no change there. Jckkerrison, what vitamins do you suggest?

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Awesome, thank you! I'll probably go ahead and start the transition now. Congrats on Buzz & Baxter's birthdaaayy!! :] So exciting! We're excited to celebrate Bruce's birthday [dorky, I know]. Hahah.

Not at home at the moment & always get it in a muddle but think the powder I use is SF-50,I also use it for a bit of a boost if any of the furries have been really off colour too but there are lots of vitamins out there some will take tablets such as Kitzyme {sorry ? on spelling of that too....} & eat them as a treat but before they are too old you are using so many for their weight that I find the powder easier but all is really a matter of choice.......

Buzz and Baxter's breeder recommended Brewers yeast but I can't remember how much or why. I will have to contact her or do a google search. Thanks Jckkerrison, I will see what I can find similar here in the USA.
Itslindsay, I don't think there are many of us on this site that think celebrating birthdays is dorky! :nod: We are still in China but plan to have a birthday party for Buzz and Baxter when we get home!