"I have two senior cats whom I've had since they were just months old. I have always purchased premium catfood for them. However, my cat sitter recently commented that my cats seemed to be vomiting an awful lot and suggested they might have an allergy to chicken.
I searched high and low for a chicken-free premium catfood (not easy to find if you read through the ingredient listing) and settled on Natural Balance Green Pea and Duck Formula. I noted an immediate stop to the the vomiting problem. Yes, they're cats and they still throw up from time to time, but it's gone from a few times a day between the two, to once every couple weeks.
As an added benefit, one of my cats was starting to get a little pudgy, but has visibly trimmed down in the 3 months he's been eating Natural Balance. I believe this is because they seem to actually be eating less. The food may seem expensive, but at the rate they are eating it, it comes to well under $10 per month, total for 2 cats. It's well worth the money!"