Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Diet for Cats With Cancer: Nutrition & Considerations (Vet Answer)

red cat eating from stainless bowl

It’s the word that no cat owner wants to hear: cancer. While cats are living longer than ever, that longevity comes with an increased incidence of a cancer diagnosis. But it’s important to note that it’s not necessarily a death sentence. Many possible treatments are available for cats with cancer, along with various supportive measures that owners can take. One is feeding your feline a proper diet, but what are the best foods for cats with cancer? Read on to find out.

divider 1 paws

Why Does Nutrition Matter for a Cat With Cancer?

Your cat’s food is where they get the nutrients that provide them with energy, protein for muscle, and vitamins and minerals for every bodily function. Without proper nutrition, their body just won’t work properly.

For a cat with cancer, the need for these vital nutrients is still there and increased in certain cases. Affected cats require everything that other cats do, and they might need a bit more to fuel their fight.

The trouble with cancer is that a cat’s appetite can be a major blockade when it comes to getting them the proper nutrition. Not eating as much or at all can be due to nausea or lethargy from the tumor itself or the cancer treatment.

Food supplements for cats and dogs with cancer
Image Credit: Velement, Shutterstock

Diet Considerations for Cats With Cancer

There’s no one-size-fits-all diet or food that is best for cats with cancer. Instead, every affected cat will need to be considered on an individual basis, with the vet looking at the type of cancer, available treatments, other health conditions, and any other signs that they are present, to determine what’s best. If the vet forgets to speak to you about feeding changes following your cat’s cancer talk, don’t be afraid to bring it up.

Also, be aware that a cat’s dietary needs may change throughout the course of their cancer journey. What works for them today may not work next week.

With this in mind, the best diet for your cat with cancer is one they will eat. A major difficulty with cancer treatment is the cat’s decreased or complete lack of appetite. Finding a food that they like and will eat even when they’re not feeling their best is crucial for getting them the nutrients that they need.

If they are currently eating a high-quality diet, continue with it unless they are diagnosed with a concurrent illness, such as kidney or intestinal disease. Then you’ll want to feed them a diet formulated for that. If this requires a switch, try to make the transition gradual, before your cat starts cancer treatments, to avoid combining a food switch with feeling poorly from surgery or their first round of chemotherapy or radiation.

Speak to a veterinarian about your concerns, and they can help guide you through food transition, recommend diets formulated for other health conditions, and set you up with a good quality diet well in advance.

Need veterinary advice but can't get to the clinic? Catster recommends PangoVet, our online veterinary service. Talk to a vet online and get the answers and advice you need for your cat without having to leave your living room — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money

What About Low-Carbohydrate Diets?

You may have heard that a low-carbohydrate diet is essential for a cat suffering from cancer. The main idea behind this is that carbohydrates are broken down into glucose, which is used by cells for energy. Unfortunately, cancer cells consume glucose like it’s candy, often using up to 10 times as much as normal cells. Researchers have reasoned that if you decrease the amount of carbohydrates and therefore, glucose, in a cat’s diet, you can literally “starve” cancer cells, causing them to die.

While this sounds great, when an otherwise normally functioning body doesn’t have glucose given to it in the form of carbohydrates, it makes its own in the liver. There have been no decent studies to show that diets low in carbohydrates have any positive effect on a cat’s cancer survival time or remission rate.

However, if you have a diabetic cat that also has cancer, a low-carbohydrate food is likely what’s already in their bowl, so continue serving it as long as they are consistently eating it.

persian cat eating dry food from bowl
Image Credit: ANURAK PONGPATIMET, Shutterstock

Should I Give Cancer Supplements to My Cat?

Along with a low-carb diet, you’re sure to be recommended different supplements that claim to be just what your cat with cancer needs. Omega fatty acids from things like fish oil, various herbs, mushrooms, turmeric, and CBD are commonly talked about.

Some of these may have benefits, but others will not. There isn’t great research out there to support the use of any supplements in felines, so always be sure to talk to a vet before giving one to your cat, cancer or not. Most of these products aren’t regulated the way that commercial foods and medications are, so what the supplement label says might not be what you’re getting, and the dose may vary. Of course, you also want to make sure the supplement you’re looking at is safe for your cat.

divider 2 cats

How to Get a Cat to Eat

It’s more often about getting your cat with cancer to eat rather than the specifics of what they are eating. Everything about cancer treatment can cause a decline in appetite, making it difficult to keep your cat on the right nutritional track.

For some cats, simple changes in flavor or texture may be enough to entice them to take a few more nibbles. Fortunately, most major cat food brands have a variety of flavors and textures, so you make changes without completely revamping your cat’s food. Switching from chicken to beef may be what your pet is looking for, or they may prefer a softer, moister food over dry kibble. Whatever the case, give in to your cat’s desires. You may want to look into high-calorie foods too, such as kitten food or those meant for hospitalized cats.

You may even turn to human food mix-ins, such as cooked eggs, lean chicken, or plain rice, to make their meals more interesting. However, since none of these foods are complete and balanced on their own, they should only be used as meal toppers, not as a major part of their diet, especially for extended periods. Otherwise, your kitty could end up with nutritional deficiencies.

cat kibble food in a bowl
Image Credit: Zsuzsa, Pixabay

What Not to Feed a Cat With Cancer

Since there isn’t a well-defined road map for feeding a cat with cancer, you may think that anything and everything is up for grabs, but unfortunately, that’s not true. You should steer clear of raw and homemade diets for the same reasons that you would for other kitties.

Raw diets in particular have an increased risk of bacterial contamination, and that’s the last thing that your cat’s already struggling immune system needs to deal with. Homemade diets may not be balanced, meaning they are lacking in essential nutrients, which can end up being deleterious to your cat’s wellbeing. If you choose to go the homemade route, check that the recipe you’re using is formulated by a veterinary nutritionist, and be ready for frequent sampling and check-ins to ensure that you’re maintaining the proper nutritional content.

divider 1 paws

In Conclusion

Certain cat food brands have released special diets for cats with cancer, and there is no shortage of information about what cats with cancer should and shouldn’t eat. But the fact of the matter is that they just need to eat. If your cat is currently on a good diet, continue with it. If they have another health condition that requires specialized food, keep using it. If your kitty needs a little nudge in their appetite from time to time, try changing flavors or textures.

Above all else, work with your veterinarian to ensure that your cat with cancer is getting the treatment and nutrition that they need.


Featured Image Credit: Asasirov, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.

How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

How to Feed a Cat with a Cone (5 Great Tips)

If your cat has just had surgery or is dealing with another medical condition, your vet may send you home with an Elizabethan...

Persian Kittens For Sale in Florida: Breeders List 2025

Catster advocates for adopting before shopping, though we fully understand there are many reasons for seeking a breeder. So, we encourage it to...

40 Aristocats Cat Names: Fairytale Options for Your Pet

The Aristocats, the classic Disney movie that stole our hearts, offers a treasure trove of pet name inspiration. Not only does it have...

Russian Blue Siamese Mix: Info, Pictures, Care & Traits

The Russian Blue Siamese mix is a rare hybrid breed resulting from pairing a Russian Blue with a Siamese. These gorgeous cats are...

More related

Are TNR Programs for Feral Cats Ethical? Vet-Verified Facts & FAQ

Roughly 3.3 million cats enter shelters annually, with many of these cats being euthanized.1 Many felines are strays that escaped their homes, with...

4 DIY Cat Bridges You Can Build Today (With Pictures)

Our cats love to hang out in weird places. With some kitties, it seems like the higher up they can get, the more...

5 Cat-Safe Incense Alternatives for Your Home: Vet Approved Advice

Incense is used in many homes to freshen the air in the home and cover unpleasant smells. Unfortunately, it is generally not considered...

Why Cats Can’t Be Considered Low Maintenance: Vet-Verified Reasons

Dogs are very high-maintenance pets as, in addition to food, attention, and affection, they also need daily exercise and training. Some dogs, especially...

Keep reading

Can Cats Eat Sherbet? Vet-Reviewed Facts & FAQ

Have you ever wondered, as you were enjoying a cold bowl of sherbet on a hot day, whether or not it would be OK to share a bit of your yummy dessert with your favorite feline companion? Most cat lovers...

Can Cats Eat Sherbet

My Cat Ate a Wasp: Is It Dangerous? Vet Reviewed Signs & Treatments

If you’ve ever been stung by a wasp, it’s definitely an experience that you don’t want to repeat! Even seeing a wasp may bring about some fear and apprehension, especially if you see your cat eating one. The good news...

My Cat Ate a Wasp

Why Do Cats Stare? Feline Behavior Explained (Vet-Reviewed Info)

If you’ve ever watched your cat mesmerized for minutes or longer by a seemingly random object, you’re not alone. Since time immemorial, humans have been fascinated by cat staring. But why do they stare in the first place? The answer...

Tortoiseshell cat starring at a window

5 Signs of Aggression in Cats: Vet-Reviewed Behavior Problems to Watch For

Aggression is a relatively common feline behavior problem, and it can have several causes, from pets getting a bit too carried away while playing to pain and fear. Feline aggression can be quite serious, it can cause injuries and make...

Scottish fold cat very angry and aggressive

My Cat Isn’t Interested in Playing: 5 Vet-Reviewed Reasons & Solutions

Playing is beneficial for cats in so many different ways as it encourages independence, promotes positive brain development, relieves stress, and keeps your cat healthy. Because of this, playing is an essential activity in every feline’s life, and most felines...

two cats playing with a toy indoors

Why is My Cat Peeing Everywhere All of a Sudden? 7 Vet-Reviewed Reasons

Cat owners can agree that the smell of cat urine is overwhelming. It’s a difficult odor to remove from furniture, carpeting, and other fabrics. Your home quickly becomes unpleasant if your kitty isn’t using their litter box. There are several...

cat with pee stain on the carpet

What to Do When Your Cat Has an Asthma Attack: Vet Approved Tips

It may be a surprise to learn that just like people, cats can have asthma, and it can be a frightening experience when your cat suddenly suffers from an asthma attack. While it’s a condition that your cat will have...

a cat that feels sick and seems to vomit

My Cat Suddenly Doesn’t Want to Be Touched – 5 Vet-Approved Reasons

If your usually loveable cat suddenly doesn’t want to be touched, you probably have reason to be concerned. It isn’t normal for cats to suddenly not like affection. Typically, there is an underlying reason, though not all of these reasons...

cream domestic cat close up photo