My Cat keeps barfing up cat food?

My cat did that to, it was mainly because she would eat way too much and then through it all back up again, i know you said u cannot limit the food but you really really need to otherwise it wont stop, feed the cat on it own a set amount of food twice a day or more if it is still quite young and then dont let it near the other food if its still ill after that there could be a more serious problem so maybe take it to the vet.