"Raw Diets Are Bad for Cats" — But Compared to What?
DISCLAIMER: This article is intended for educational purposes only and does not constitute veterinary advice. Every cat is an individual and dietary changes should be discussed with a qualified veterinarian who knows your pet’s health history. If your cat has an existing health condition, always consult your vet before making changes to their diet.
Raw feeding for cats is one of the most dismissed topics in feline nutrition, yet the clinical evidence increasingly challenges the conventional warnings. This article examines what happens to a cat’s body when it eats a carbohydrate-heavy commercial diet, what peer-reviewed studies show when raw and kibble diets are compared directly and why the question “is raw food dangerous?” deserves a more honest and evidence-led answer than most cat owners receive.
The "complete and balanced" illusion
The processed pet food industry rests much of its authority on a single stamp of approval: “complete and balanced.” This phrase implies perfection, a scientifically optimised meal in every bowl. In reality, those nutrient profiles are theoretical baseline estimates, derived from laboratory models, not living, breathing cats. They tell us what is in the bag, not what your cat’s body can actually absorb and use.
What ends up in commercial products can be startling. A comprehensive analysis of 177 complete commercial pet foods found that the vast majority failed to comply with statutory guidelines, showing severe calcium-to-phosphorus imbalances and unsafe overages of copper and selenium. In 2025, a major legal case against a well-known pet food manufacturer confirmed that entire batches of a leading product contained more than four times the legal limit of Vitamin D, causing serious health risks for thousands of animals. Processed food carries its own very real dangers, they simply receive far less attention.
Why is a cat's diet different from a dog's?
This point cannot be overstated: the domestic cat is one of the most specialised carnivores on the planet. Unlike dogs, who have adapted to a degree of dietary flexibility alongside humans over millennia, the cat has not. Cats entirely lack salivary amylase, the enzyme that begins carbohydrate digestion in the mouth. Their pancreatic amylase levels are negligible and they lack functional hepatic glucokinase, the liver enzyme that processes glucose in omnivores. Put simply, a cat’s body has no efficient mechanism for handling carbohydrates at all.
Their metabolism is designed to run on animal protein and fat. Under normal circumstances, their liver continuously performs gluconeogenesis, producing glucose from amino acids, not from starch. When a cat eats a commercial dry diet containing 30% to 60% carbohydrate, it is not simply eating something suboptimal. It is eating something its body was never built to process. Recent clinical research vividly confirmed this: cats fed starch-heavy meals showed the lowest energy expenditure and produced distinct white faeces, a striking physical sign of the body’s failure to absorb and utilise processed grains. The link between long-term kibble feeding and the modern epidemic of feline obesity and type-2 diabetes is not a coincidence.
What does the clinical research actually show?
When researchers have compared raw and kibble diets directly, the results are consistent. Studies examining digestibility confirm that raw meat diets, including those safely treated with high-pressure processing, yield significantly higher absorption of nutrients. More is extracted from every meal, which is why raw-fed cats tend to produce smaller, firmer, and far less odorous stools.
Structural changes have also been documented. Ultrasound studies comparing raw-fed and kibble-fed animals found that those on a raw diet developed significantly thicker, more robust gastrointestinal wall layers throughout the entire digestive tract, a marker of a stronger, more resilient gut. Blood parameters in these animals remained completely stable, demonstrating that the diet is not only better absorbed, but physiologically safe.
On a metabolic level, the picture is equally clear. Individuals on high-carbohydrate kibble diets show elevated levels of total cholesterol, LDL, HDL, and VLDL, with some animals surpassing the upper limit of clinical reference ranges. Raw-fed animals, by contrast, show reduced fasting glucose and total cholesterol, shifting into a mild, natural state of nutritional ketosis, a clean, stable energy state for which feline physiology is ideally suited.
Is bacterial contamination really a risk with raw cat food?
The most persistent objection to raw feeding is the spectre of bacterial contamination. It is a serious concern worth examining honestly and when we do, the evidence is rather reassuring. A large-scale epidemiological survey of over 16,000 households worldwide found that confirmed pathogen transmission from raw pet food to a human occurred in just 0.02% of cases. Separate diagnostic sampling showed that raw-fed cats posed no greater risk of salivary Salmonella contamination to their owners than kibble-fed cats, with the only positive sample in the study coming from an animal eating processed food.
What raw feeding does reliably do is enrich the gut microbiome. Raw-fed animals consistently show greater fecal microbial diversity, including beneficial bacterial populations that produce short-chain fatty acids, compounds that protect and soothe the gut lining and support immune function.
Transitioning your cat to a raw diet
One genuinely practical challenge is that cats are highly resistant to dietary change. Years of eating kibble, which is heavily coated with artificial fats and flavour enhancers to mask its carbohydrate content, can create a powerful sensory preference that takes patience and a carefully structured approach to undo. It is also worth remembering that for cats, eating is never just a matter of nutrition. The texture, temperature and presentation of food are part of
the experience itself, and honouring that, offering variety, respecting preferences and making mealtimes enriching, is as important as what is in the bowl. That process deserves its own dedicated guide. But understanding the biology behind it is the essential first step.
There is still a great deal we do not know about companion animal nutrition. The field is young, the studies are often small and long-term data comparing dietary approaches across a cat’s full lifespan remain scarce. That uncertainty is not a reason for complacency, it is a call for rigour. We need more research, better-designed trials and a genuine willingness to evaluate all feeding approaches on equal terms, free from commercial bias and ideological attachment.
What cat owners and clinicians alike deserve is not a verdict delivered with false confidence, but an honest, evidence-led conversation, one that places different diets side by side and asks, without prejudice, what the data actually shows. That is the only way to move nutrition science forward and the only standard worthy of the animals in our care.
READ the full article and more in the JUNE 2026 Magazine.
REFERENCES:
1. Anturaniemi, J., et al. (2019). Owners’ perceptions of acquiring infections from raw pet food: a global survey of 16,475 households. Frontiers in Veterinary Science / BMC Veterinary Research.
2. Anderson, M. C., et al. (2025). A comparison of peripheral blood mononuclear cell gene expression and plasma IgA in dogs fed raw food versus kibble. Journal of Animal Science.
3. Consumer Reports & Court Records (2025). Susan Thixton v. Mars Petcare US, Inc. — Excessive Vitamin D contamination in Pedigree Complete Nutrition batches. TruthaboutPetFood.com.
4. Davies, M., et al. (2017). Mineral analysis of complete dog and cat foods in the UK and compliance with European guidelines. University of Nottingham, bioRxiv preprint.
5. Holm, S., Baarman, E., Anturaniemi, J., Hemida, M., Salin, S., Vuori, K. A., Moore, R., & Hielm-Björkman, A. (2025). The effect of a kibble diet versus a raw meat-based diet on energy metabolism biomarkers in dogs. The Veterinary Journal, vol. 314, 106462.
6. Jantzi, S. A. M., Anan, S. F., Brewer, J., et al. (2026). Macronutrient and energy metabolism changes in domestic cats when fed cornstarch, whey protein, and poultry fat. British Journal of Nutrition, 135(3).
7. Neshovska, H., & Shindarska, Z. (2021). Comparative study of the digestibility of dry and raw food in dogs. International Journal of Veterinary Sciences and Animal Husbandry, 6(2), 01–03.
8. Pettersson, H. A. T. (2026). Effects of a Raw Food Diet on Gastrointestinal Wall Thickness in Lithuanian Hounds Assessed by Ultrasound. Master Thesis, Lithuanian University of Health Sciences.
9. Pottenger, F. M. (1946). Symptoms produced by cooked versus raw meat diets in cats. Pottenger’s Cats Study (1932–1942).
10. Schmidt, M., et al. (2018). The fecal microbiome and metabolome differs between dogs fed Bones and Raw Food (BARF) diets and dogs fed commercial diets. PLoS ONE, 13(8), e0201279.
11. Towler (2016). Is there a higher risk of salivary Salmonella in domestic dogs when fed a biologically appropriate raw food diet. Natures Menu Internal Veterinary Research Report.
DISCLAIMER: This article is intended for educational purposes only and does not constitute veterinary advice. Every cat is an individual and dietary changes should be discussed with a qualified veterinarian who knows your pet’s health history. If your cat has an existing health condition, always consult your vet before making changes to their diet.
FAQ Section
Q: Is raw food safe for cats?
A: Raw food for cats carries risks that are significantly lower than commonly assumed. A global survey of over 16,000 households found confirmed pathogen transmission from raw pet food to humans occurred in only 0.02% of cases. With proper hygiene practices, quality sourcing the safety profile is comparable to and in some respects better than, commercial processed diets, which carry their own documented contamination risks.
Q: Why can’t cats eat a lot of carbohydrates?
A: Cats are obligate carnivores with a digestive system that has no efficient mechanism for processing carbohydrates. They lack salivary amylase, have negligible pancreatic amylase and are missing the liver enzyme that handles glucose in omnivores. When cats eat the 30–60% carbohydrate content typical of commercial dry food, the body cannot absorb or utilise it well. Research links long-term high-carbohydrate feeding in cats to obesity, type-2 diabetes and poor energy metabolism.
Q: What does the research say about raw feeding for cats vs kibble?
A: Clinical studies comparing raw feeding for cats with kibble diets consistently show that raw food produces higher nutrient absorption, better gut microbiome diversity and healthier metabolic markers including lower fasting glucose and reduced cholesterol. Ultrasound studies have also found that raw-fed cats develop thicker, more robust gastrointestinal wall layers, a sign of a stronger digestive system overall.
Q: How do I transition my cat from kibble to a raw diet?
A: Transitioning cats from kibble to raw food requires patience because cats form strong sensory preferences for foods they have eaten since kittenhood, particularly due to the artificial flavour coatings on dry food. A gradual introduction, adjusting texture, temperature and presentation over several weeks, is far more successful than an abrupt switch. Consulting a vet experienced in raw feeding or a pet nutritionist can help you design a structured transition plan suited to your cat’s individual needs.
Q: Is commercial cat food really dangerous?
A: Commercial cat food is not inherently dangerous, but it carries risks that receive far less attention than those associated with raw feeding. A 2025 legal case confirmed that batches of a major commercial brand contained more than four times the legal limit of Vitamin D, causing serious health problems in thousands of animals. A separate analysis of 177 commercial pet foods found widespread non-compliance with nutrient guidelines, including unsafe levels of copper and selenium. No feeding approach is without risk. The goal is to evaluate all options honestly.
Dr. Amaya Espindola (MRCVS)
Dr Amaya Espíndola is a veterinary surgeon who has dedicated the past 13 years exclusively to cats. Her work focuses on feline health from a holistic and integrative perspective, with a strong emphasis on emotional wellbeing, the human–cat relationship and natural nutrition. She is the Director of Felvet LImited, the creator of Lullabies for Cats, works internationally through online consultations and is Senior Vice President of the Raw Feeding Veterinary Society.