Article published Year 2021 – Updated 2026
Why is changing diet the first cure? (The Warburg Effect)
Cancer cells have a different metabolism than healthy cells: they consume glucose (sugar) at a rate about 20 times higher. This phenomenon is known as the Warburg Effect. Giving your cat kibble rich in grains, potatoes or starches is, literally, providing “quick fuel” to the tumor. The goal of the oncological diet is to remove this fuel (carbohydrates) and replace it with noble fats and proteins, which the tumor struggles to use.
The cat during the course of the disease must have “access” to all the nutrients to support the immune system. The diet for a cat with cancer must be rich in quality and digestible proteins with the addition of vegetables such as pumpkin useful in case of constipation or diarrhea, CEREALS, CARBOHYDRATES, CORN AND KIBBLE MUST BE ABSENT.
Feeding a cat cancer can be very difficult. However, feeding a cat during cancer treatment is no less important than the therapy itself! Weight loss and the associated deterioration in quality of life are not only detrimental to treatment, but can also shorten the cat’s life.
Feeding cats with cancer
1) Pay more attention to nutrition and supplements that are added to the diet
2) Some types of tumors “physically” interfere with nutrition
- Tumors that develop in the oral cavity cause pain and the cat cannot feed itself
- Tumors that develop in the gut alter nutrient absorption.
How to manage the diet of the cat with cancer
- Cancer cells obtain their energy from CARBOHYDRATES and at the same time subtract amino acids
- Cancer cells CANNOT use lipids (fats) for energy
This nutritional aspect is very important: ADDING fats to the diet slows tumor growth and provides energy to the cat.
Nutrition and cancer in cats FOODS TO AVOID
What to Give and What to Avoid: The Food List
🔴 TO ELIMINATE (The fuel of the tumor):
- Kibble (also Grain Free): They almost always contain starches (potatoes, peas) necessary to create the “ball”.
- Rice, Corn and Cereals: Glycemic index too high.
- Complex carbohydrates: Pasta, bread or biscuits for animals.
🟢 TO PROMOTE (Nourishment for the body):
- High quality animal protein: Fresh meat (turkey, chicken, lamb) or fish, lightly seared or raw (if digestion permits).
- Healthy fats: Fish oil (Omega-3), coconut oil (MCT), egg yolk.
- Vegetables (few): Broccoli or leafy greens (rich in antioxidants) in small amounts.
NO SUGAR
The tumor is fed by sugars, check the composition of the food you give your cat. No corn, beetroot or other sugars.
NO DAIRY
Cats do not produce the enzyme lactase, LACTOSE is a sugar!
NO WHEAT AND CEREALS
Cats do not use carbohydrates as an energy source, carbohydrates produce mucus, food intolerances, malabsorption, deficiencies and intestinal disorders.
Nutrition and cancer in cats – RECOMMENDED FOODS
The diet must be palatable, digestible, and maintain a correct nutritional status.
PROTEIN
Important for their amino acid content, the cat draws energy from proteins because it is able to transform them into glucose, it is preferable when possible to eat very digestible steamed or undercooked food, choose white meats.
FAT
Fats provide energy to the cat, we can choose, for example, to add clarified butter, coconut oil, or salmon oil, omega 3, to the food.
Cat with cancer does not eat
What to do if the cat with cancer does not eat develops severe nausea that may be secondary to drug therapies (chemotherapy), or caused by the tumor itself; in both cases it is necessary to manage the lack of appetite in order to avoid weight loss and neoplastic cachexia.
What we can do for a cat with cancer
- Feeding small portions of food
- Add water to its food – Cats may prefer soft, more liquid food, and water will help hydrate it
- Avoid drug/food combination – do not mix medication with food or water
- Do not force the cat to eat if he is nauseous, contact the veterinarian for the choice of anti-nausea drugs, there are also natural ones such as Nux vomica, Homeos.
- Vary diet often
- Providing food that is too “fragrant” could prove counterproductive
- Do not heat the food to make it more palatable – the cat should smell as little as possible
- Making the place where he eats quieter
- A cat is a 100% carnivore, which means that its body is able to synthesize all the necessary nutrients, receiving only protein food. In other words, a cat can only be fed meat or fish and will get carbohydrates and fats from them.
- Dietary changes must take place very gradually so as not to alter the balance of the gastrointestinal tract and lead to problems such as nausea or diarrhea.
I recommend avoiding dry pet-food as much as possible, so absolutely no kibble, the same goes for raw meat or Barf diets, if the cat has to follow a drug therapy based on chemotherapy, immunosuppressive drugs or cortisone he will have a weak immune system and the intestinal mucosa altered by drugs, choose steaming. All supplements should never be added to hot food!
Beyond the Bowl: The Importance of Omega-3s and Supplements
OMEGA-3 ESSENTIAL FATTY ACIDS – It is very beneficial to add pharmaceutical grade and heavy metal-free omega-3 fatty acids to your diet as these control inflammatory processes in the body and can increase the effectiveness of cancer treatment.
These fatty acids can prevent the development of cancer-induced tumors, the growth of tumors, and delay cancerous cachexia. Be careful in choosing the supplement, omega 6 precursors of inflammation are not recommended, supplement with mycotherapy, vitamins, turmeric, coenzyme Q10, selenium, zinc,
Discover 30 Natural Remedies for Cancer in Cats
AMINO ACIDS – Supplementation with taurine and arginine
ARGININE + OMEGA-3 IMPROVE
- THE QUALITY OF LIFE
- METABOLIC PARAMETERS
- REDUCE INFLAMMATION
ENZYMES
Enzymes have a powerful action, usually enzymes are used in pancreatic insufficiencies. Today they are increasingly being used for cancer treatment. They reduce inflammation, useful in viral diseases and cancers.
Antioxidants and Superfoods. As with us, cats also benefit from antioxidant properties and superfoods: when these are added to their diet, free radicals and oxidative stress cause disease, premature aging and weaken the immune system.
See 30 Natural Remedies for Cancer in Cats
Frequently Asked Questions About Diet for Cats with Cancer
My cat with cancer doesn’t want to eat, what do I do?
Loss of appetite (anorexia) is common. Don’t force it. Try lukewarm the food to release the aromas, offer very palatable foods such as meat-only baby food (without onion) or use natural appetite stimulants (or pharmaceutical prescribed by the vet) to avoid hepatic lipidosis.
Can I give raw meat to a cat undergoing chemotherapy?
It is a debated topic. Because chemotherapy lowers immunity, many oncologists advise against raw meat (BARF) because of the bacterial risk. At this stage, steamed or seared meat is the safest and most digestible choice.
What are the best treats for a cat with cancer?
Avoid industrial biscuits. The best snacks are beef jerky cubes, chunks of Parmesan cheese (if tolerated), or small pieces of cooked meat.
Disclaimer: The Contents Are For Informational Purposes Only And Under No Circumstances Can They Constitute A Prescription Of A Treatment Or Substitute For A Specialist Visit Or Direct Relationship With Your Veterinarian/Doctor.
