Originally Posted by ALC
It is science diet for food allergies.
Ya, I was afraid of that. It's actually a very poor quality food and really doesn't address allergy issues in a way that's healthy for cats. Can actually lead to other health problems (such as diabetes!). Please read that link above, it will really open your eyes regarding what cats should and shouldn't be eating. (hint - dry food is bad, wet food is much better).
What sort of symptoms did Lily have that made the vet think it was food allergies?