Updated September 22, 2026. Fact-checked against veterinary sources; review by a licensed veterinarian is in progress. See our editorial policy.
Quick answer: Diet is often the first and most important step for cats with inflammatory bowel disease (IBD) or chronic enteropathy. Many cats improve on a hydrolyzed protein or novel protein diet fed strictly for several weeks, and some do well on a highly digestible gastrointestinal diet. Your vet will likely combine diet with other treatment, such as vitamin B12 supplementation or medication, depending on your cat’s test results.
What is IBD in cats?
IBD is long-term inflammation of the stomach or intestines. Signs include chronic vomiting, diarrhea, weight loss, and appetite changes. Other conditions look similar, including intestinal lymphoma, parasites, hyperthyroidism, and pancreatitis, so vets work to rule those out.
Diet options your vet may suggest
- Hydrolyzed protein diets: proteins broken into pieces too small for the immune system to react to. Often the first choice.
- Novel protein diets: a protein your cat has never eaten before, such as rabbit or venison. Ingredient histories need to be thorough for this to work.
- Highly digestible gastrointestinal diets: easy-to-digest foods that reduce the work the intestines must do.
- Fiber adjustments: some cats, especially those with colon involvement, benefit from added fiber.
How a food trial works
- Feed only the trial food, usually for at least a few weeks. Your vet will set the length.
- No treats, table food, flavored medications, or other pets’ food, unless your vet approves them.
- Track vomiting, stool, appetite, and weight in a simple log.
- If your cat improves, your vet may later reintroduce old foods one at a time to confirm the trigger.
Other treatments
Many cats with chronic intestinal disease have low vitamin B12 (cobalamin), which your vet can test and supplement. If diet alone isn’t enough, vets may add anti-inflammatory medication such as steroids. Biopsies may be recommended to tell IBD apart from intestinal lymphoma.
Tips for success
- Switch foods gradually, and never let your cat go more than a day without eating. Cats that stop eating can develop hepatic lipidosis.
- If your cat refuses the new food, call your vet about alternatives rather than waiting it out.
- Keep feeding the prescribed diet even when your cat looks better, unless your vet says otherwise.
When to see a vet
See your vet for vomiting more than occasionally, diarrhea lasting more than a couple of days, weight loss, or appetite changes. Seek urgent care for repeated vomiting, blood in vomit or stool, not eating for more than 24 hours, or lethargy.
Frequently asked questions
Is grain-free food better for IBD?
Not necessarily. The protein source and digestibility usually matter more than whether a food contains grains.
Can probiotics help?
Some cats may benefit, but evidence is mixed. Ask your vet before adding one, and choose a veterinary product.
Sources
- Merck Veterinary Manual: inflammatory bowel disease in small animals
- ACVIM consensus and veterinary gastroenterology guidance on chronic enteropathy in cats
This article is for general education and is not a substitute for care from your own veterinarian. Learn about The Pet Vet and our editorial policy.