Hi stranger! Signing up for MypetMD is easy, free and puts the most relevant content at your fingertips.

Get Instant Access To

  • 24/7 alerts for pet-related recalls

  • Your own library of articles, blogs, and favorite pet names

  • Tools designed to keep your pets happy and healthy



or Connect with Facebook

By joining petMD, you agree to the Privacy Policy.

petMD Blogs

Written by leading veterinarians to provide you with the information you need to care for your pets.

Subscribe to
Nutrition Nuggets
 
 
Your cat's nutrition is important for a healthy & happy life. petMD experts help you to know what to feed your cat, how much food to feed, and the differences in cat foods, so your cat gets optimum nutrition.
Nutrition Nuggets is the newest offshoot of petMD's Cat Nutrition Center. Each week Dr. Coates will use her expertise and wisdom to blog about the intricacies of cat nutrition.

Food Intolerance or Food Allergy?

July 06, 2012 / (2) comments

Feline food allergies and food intolerances are similar but not identical conditions. An allergy involves the immune system. Basically, the body is responding to an ingredient (or ingredients) in the cat’s food as if it was an invading microorganism, and then mounts an immune reaction to fight it off. Food intolerance revolves around the digestive system’s inability to handle a particular ingredient in a normal way.

I like to use a human example when explaining the difference between food allergy and food intolerance to clients. Many people know of someone who is allergic to peanuts, shellfish, or something else they might run across in a meal. Yes, these unfortunate folks may experience gastrointestinal symptoms as a result of their allergies, but other, more serious symptoms frequently develop too. These may include hives, rashes, itchiness, facial swelling, and even a potentially life-threatening allergic reaction called anaphylaxis.

Lactose intolerance is a classic example of food intolerance. Clinical signs are generally limited to the gastrointestinal tract (e.g., nausea, diarrhea, abdominal pain, and flatulence). Some people also report headaches and irritability, but this is hard to assess in cats. Symptoms may be manageable enough that people will put up with them from time to time to indulge in a favorite food.

The differences between food allergy and food intolerance are similar for cats. When an owner brings a cat with a food allergy in to the veterinary clinic, itchiness and skin lesions, not gastrointestinal problems, are usually the primary concerns (although with continued questioning we often learn that the cat does also vomit excessively and/or have loose stools ). On the other hand, a cat with a true food intolerance will typically have chronic or intermittent vomiting, diarrhea, and/or excess gas production without dermatologic or other issues, unless the individual also has an unrelated disease that is responsible for those symptoms.

The cornerstone of therapy for both conditions is avoiding the offending ingredient(s) (although this is sometimes easier said than done). If you and your veterinarian perform a food trial with a novel ingredient or hydrolyzed diet and your cat’s symptoms disappear, you can simply continue feeding that food or slowly reintroduce traditional ingredients to determine which one(s) your cat reacts to so you can pick foods without them in the future.

If your cat’s response to a rigorous food trial (i.e., 8-12 weeks of eating NOTHING but a novel ingredient or hydrolyzed diet) is less than ideal, additional diagnostic testing becomes necessary. In some cases, a second dietary trial with a different type of hypoallergenic food is the best option, but sometimes gastrointestinal biopsies are needed to definitively distinguish between food allergies, food intolerances, and other conditions with similar clinical presentations.

If the final diagnosis is a food allergy, and hypoallergenic diets alone are not adequately controlling a cat’s symptoms, instituting immunosuppressive drug therapy is generally the next step. These medications are not without significant side effects, and are ineffective against food intolerances, so I don’t reach for them willy-nilly. When a cat does not respond satisfactorily to several dietary trials and I am convinced that food intolerance is to blame, the search for a diet without the ingredient(s) that trigger the adverse reaction must go on.

Dr. Jennifer Coates

Image: Ljupco Smokovski / via Shutterstock

 

Subscribe to Nutrition Nuggets

Comments  2

Leave Comment

 



ABOUT NUTRITION NUGGETS

JENNIFER COATES, DVM

Photo of Jennifer

... graduated with honors from the Virginia-Maryland Regional College of Veterinary Medicine in 1999. In the years since, she has practiced veterinary medicine in Virginia, Wyoming, and Colorado. She is the author of several books about veterinary medicine and animal care, including the Dictionary of Veterinary Terms, Vet-Speak Deciphered for the Non-Veterinarian .

Jennifer also writes short stories that focus on the strength and importance of the human-animal bond and freelance articles relating to a variety of animal care and veterinary topics. Dr. Coates lives in Fort Collins, Colorado with her husband, daughter, and pets.

  • Lifetime Credits:
  • Today's Credits:
Hurry Before All Seats are Taken!
Enroll
Be an A++ Pet Parent! Take fun & free courses to earn badges & certifications. Choose a course»

Poll


 
MORE FROM PETMD.COM