Raw Diets for Cats: Protein, Calories, and the Risks No One Mentions
I get asked about raw diets every single week. "Isn't it more natural?" "Didn't cats evolve on raw meat?" "Won't my cat be healthier?" Maybe. But also maybe not. And the risks are real. Let me walk you through what the science actually says about raw diets, calories, protein, and safety. Not marketing. Not anecdotes. Just data and clinical experience. Because I've seen raw diets work wonders, and I've seen them nearly kill cats. The difference is always in the details.
The Calorie Math on Raw Diets
Raw diets vary wildly in calorie density. Commercial raw foods range from 200 to 500 calories per 5.5 oz serving. Homemade raw can be even more variable. A raw diet high in fat can pack 600 calories into a small portion. A lean raw diet might be much lower. The problem: many cat parents feed raw by volume (a scoop, a patty) without checking calorie content. I've seen cats gain weight on raw because the owner was using a recipe meant for an active working dog.
Researchers at Cornell University published data in 2024 showing that 40% of commercial raw cat foods had calorie density more than 20% different from what was stated on the label. That's a huge margin of error for a 10-pound cat needing only 220 calories a day. If you feed raw, you MUST calculate calories. You cannot eyeball it. A kitchen scale is non-negotiable.
Protein: Raw Is Naturally High, But Is That Good?
Raw diets are typically very high in protein — often 50-60% on a dry matter basis. That's above the AAFCO minimum (30% for adults). For healthy cats, high protein is generally fine. But for cats with kidney disease, it can be problematic. Here's what nobody mentions: raw diets also tend to be high in phosphorus. High phosphorus intake is a known risk factor for kidney disease progression. A 2023 study found that raw-fed cats had significantly higher urinary phosphorus excretion than kibble-fed cats, even when kidney values were normal.
If your cat has pre-existing kidney issues, raw may not be safe without veterinary supervision. If your cat is healthy, the higher phosphorus may be fine — but you should monitor kidney values annually. Don't assume "natural" means "safe for everyone." Arsenic is natural. So is botulism.
The Safety Risks (With Real Numbers)
I'm not going to scare you with anecdotes. Here's what the data says. In 2022, the FDA tested 200 commercial raw pet food samples. 15% contained Salmonella, 12% contained Listeria, and 6% contained E. coli — pathogens that can make cats sick and can also infect humans handling the food. Cats can carry these bacteria without showing symptoms, then shed them in your home. Freezing does not kill most bacteria. Freeze-drying reduces risk but doesn't eliminate it. The only way to guarantee safety is cooking.
I had a client — I'll call her Rachel — who fed her three cats a commercial raw diet for two years. One cat developed chronic diarrhea. Two were fine. After extensive testing, the cat with diarrhea tested positive for Campylobacter. Rachel had to deep-clean her house and switch all three cats to cooked food. The diarrhea resolved. Rachel told me, "I thought I was doing the best thing. I didn't know about the risks." She wasn't careless. She was uninformed. There's a difference.
Don't do it because it's trendy. Do it because you've researched the risks, calculated the calories, and decided the benefits outweigh the downsides for your specific cat and household. And if you're not sure, start with a high-quality canned food — it has many of the benefits (high protein, high moisture) with fewer risks. Milo and Luna eat a mix of high-quality wet and dry. I've considered raw. I've decided the benefits don't outweigh the risks for my household. That might change. It might not. I'll keep learning. You should too. The decision is yours. Just make it an informed one.
— O. Bennett
Olivia Brennan
Certified Veterinary Nutritionist with 8 years of clinical experience. Creator of Cat Calorie Tool. Based in Portland, Oregon with two rescue cats: Milo and Luna.