Best Cat Food for Food Sensitivities

Food sensitivity and food allergy are often treated as the same thing. They are not, and the difference is worth understanding before you change anything.

A food allergy is an immune reaction — it needs prior exposure and can be provoked by very small amounts. A food intolerance has nothing to do with the immune system; it is a digestive or metabolic issue, such as the enzyme shortfall behind lactose intolerance. That means intolerance can appear the first time a cat eats something, and it is generally dose-dependent — a little is fine, a lot is not.

Cats present differently from dogs here, and it is a real difference rather than a nuance. Vomiting is much more prominent in cats: among cats with individually reported food-reaction signs, 38% vomited and 45% had diarrhoea, compared with 2% and 93% in dogs. Persistent vomiting in a cat should not be written off as normal.

The honest limitation: no blood, saliva or hair test reliably identifies either intolerance or allergy, and none separates the two. Both are worked out by removing the suspect food. Veterinary guidance is to consider an elimination diet early in the work-up of chronic vomiting and diarrhoea, not after everything else has failed.