There is no shortage of advice about what to feed your cat. Pet food marketing is sophisticated, online forums are passionate, and well-meaning friends are full of opinions. The result is that many cat owners are making food decisions based on information that is either outdated, oversimplified, or shaped more by trends than by science. Getting nutrition right matters — what your cat eats every day is one of the most consequential decisions you make for their long-term health. Here is what we actually see getting cats into trouble, and what the evidence points to instead.
Myth 1: Dry food is ALL CATS NEED
Dry kibble is convenient, shelf-stable, and heavily marketed — so it is understandable that many cat owners use it as the foundation of their cat’s diet. But cats are obligate carnivores who evolved in desert environments, and their ancestors obtained most of their water from the prey they ate. As a result, cats have a naturally low thirst drive and do not compensate well when their food contains very little moisture.
Kibble typically contains around 10% moisture. Wet food typically contains 70–80%. That gap matters. Cats who eat primarily dry food often live in a state of mild, chronic dehydration — which places ongoing strain on the kidneys and urinary tract.
Feline chronic kidney disease is one of the most common conditions we see in older cats, and lower urinary tract disease is a frequent reason for emergency visits. Both have strong dietary links.
This does not mean kibble is harmful in all contexts, or that every cat eating dry food will develop kidney disease. But for most cats, a diet with wet food as the primary component — or at minimum a significant one — is closer to what their physiology is built for. The American Association of Feline Practitioners (AAFP) has published guidance on feline nutrition that supports moisture-rich diets as a cornerstone of preventive care.
What to feed instead: Prioritize wet food as the main component of your cat’s diet. If cost or convenience makes all-wet impractical, a combination approach — wet food once or twice daily, with a measured amount of kibble — is a reasonable middle ground. Talk to us about what ratio makes sense for your cat’s age, weight, and health status.
Myth 2: Grain-free means healthier
Grain-free pet food became enormously popular in the 2010s, driven in part by the idea that grains are unnatural for cats and dogs, and in part by the parallel rise of grain-free eating among humans. The marketing was compelling. The science is more complicated.
Cats do not have a strong nutritional need for grains, and a grain-free diet is not inherently harmful.
But “grain-free” is not the same as “better.” Many grain-free formulas replace grains with legumes — lentils, peas, chickpeas — as a primary carbohydrate source. In 2018, the U.S. Food and Drug Administration (FDA) opened an investigation into a potential link between legume-heavy grain-free diets and dilated cardiomyopathy (DCM), a serious heart condition, in dogs. The research is ongoing and the picture is not yet fully clear — and the concern has been raised primarily around dogs rather than cats — but it introduced legitimate questions about whether legume-heavy formulations are the nutritional step forward they were marketed as.
The more important point is this: “grain-free” is a marketing category, not a nutritional standard. A grain-free food can still be low in protein, high in carbohydrates, and poorly suited to a cat’s actual dietary needs.
What to feed instead: Rather than filtering by “grain-free,” look at the ingredient list and guaranteed analysis. For cats, high animal-protein content, named meat sources (chicken, salmon, turkey — not “meat by-products” as the primary ingredient), and low carbohydrate load matter more than the presence or absence of grains. When in doubt, ask us — we can help you read a label.
Myth 3: Raw food diets are the most natural option
The raw feeding movement makes an intuitive argument: cats in the wild eat raw prey, so raw food must be closer to what their bodies are designed for. There is something to the premise. But the execution introduces risks that are worth understanding before committing to a raw diet.
The most significant concern is bacterial contamination. Raw meat — even high-quality, human-grade product — can harbor Salmonella, Listeria, Campylobacter, and E. coli. Cats can shed these pathogens in their feces even when they appear healthy, creating a transmission risk for humans in the household, particularly children, elderly individuals, and anyone who is immunocompromised. The FDA’s Center for Veterinary Medicine has issued guidance specifically cautioning against raw pet food diets for this reason.
Beyond safety, nutritional balance in a raw diet is genuinely difficult to achieve without expert formulation. Homemade raw diets in particular frequently lack adequate taurine, calcium, or other essential nutrients — deficiencies that may not manifest clinically for months or years, but that cause real harm over time.
Taurine deficiency in cats leads to dilated cardiomyopathy and retinal degeneration, both serious and potentially irreversible.
What to feed instead: If you are drawn to raw feeding because of concerns about processed food quality, a better path is usually a high-quality commercial wet food with named animal proteins, minimal fillers, and AAFCO nutritional adequacy certification.
If you are committed to exploring raw, please talk to us first — there are commercially prepared raw diets that have undergone high-pressure pasteurization to reduce bacterial risk, and we can help you evaluate whether they make sense for your specific cat.
Myth 4: My cat will stop eating when they’re full
This one is intuitive — animals in the wild self-regulate, so surely a domestic cat will too. But indoor cats are not living the energetic lives their metabolisms evolved for, and boredom, habit, and the palatability of commercial food all conspire against built-in portion control.
Research consistently shows that many cats — particularly indoor cats with limited activity and free access to food — will overeat. According to the Association for Pet Obesity Prevention, obesity affects a significant portion of domestic cats in the United States, and the consequences compound over time: diabetes, joint disease, hepatic lipidosis, reduced life expectancy. Free feeding (leaving food out at all times) is a leading contributor.
There is also a behavioral dimension. Cats who eat quickly from an unrestricted bowl are consuming a meal in seconds that should, physiologically, take much longer to “hunt.” That mismatch contributes to both overeating and boredom.
What to feed instead: Scheduled meals — typically two per day for adult cats — with measured portions based on your cat’s ideal body weight rather than their current weight. Puzzle feeders are an excellent addition; they slow eating, add mental engagement, and help cats feel more satisfied after a meal.
If you are unsure what your cat’s ideal weight is or how much they should be eating, a wellness visit is the right place to start — we can calculate a target and build a feeding plan.
Myth 5: All life stages need the same food
A kitten, a healthy adult cat, and a 12-year-old senior have meaningfully different nutritional requirements — and feeding the same food across all stages is a missed opportunity at best, and actively harmful at worst.
Kittens need higher caloric density, more protein, and specific levels of nutrients like DHA to support brain and eye development. Foods labeled for “all life stages” are often formulated to meet kitten requirements — which means they can be too calorie-dense and too high in phosphorus for an older cat whose kidneys are less efficient at filtering it.
Senior cats — generally those seven years and older — benefit from diets that are carefully calibrated on phosphorus, moderately adjusted on protein (the old advice to dramatically reduce protein in senior cats has been largely revised; the current thinking is that protein quality matters more than restriction, except in confirmed kidney disease), and attentive to joint health and weight management. Geriatric cats, those fourteen and older, often need additional support for muscle mass maintenance and digestibility.
The life-stage designations on pet food labels exist for a reason. AAFCO sets different nutritional standards for growth, maintenance, and all life stages — and those differences matter for your cat’s long-term health.
What to feed instead: Match the food to your cat’s current life stage, and revisit the choice at every wellness visit. Transitions between stages are a natural part of the conversation we have with owners at CCC — if your cat is approaching senior age and still eating adult food, or if you have a kitten who has been on an all-life-stages formula, that is worth discussing.
Schedule An Appointment with Catonsville Cat Clinic to Discuss Your Cat’s Nutrition Today
Nutrition is one of the areas where small, consistent decisions compound dramatically over a cat’s lifetime. The good news is that getting it right does not have to be complicated — it just requires moving past the marketing and focusing on a few fundamentals: moisture, protein quality, appropriate portion control, and life-stage suitability.
If you have questions about what your specific cat should be eating — or if you want a second opinion on the food you are currently using — bring it up at your next visit. Dietary counseling is part of what we do at every Complete Wellness Exam.
Schedule an appointment with Dr. Nesbitt at Catonsville Cat Clinic and let’s make sure your cat’s diet is working as hard for them as it should be.