Separating Fact from Fiction About Cat Nutrition

The image of a cat lapping up a saucer of milk is deeply embedded in popular culture, but it misrepresents feline biology. Kittens produce the enzyme lactase to digest their mother's milk, but lactase production typically declines after weaning. For most adult cats, consuming cow's milk — which contains more lactose than cat's milk — leads to gastrointestinal discomfort. Even cats that tolerate small amounts gain little nutritional benefit. Fresh water is the appropriate and sufficient drink for adult cats.

Grain-free diets became popular partly due to the idea that grains are "unnatural" fillers. While it's true that cats have minimal dietary carbohydrate requirements compared to omnivores, the absence of grains doesn't guarantee a better food. Many grain-free formulas substitute grains with other carbohydrate sources like potatoes or peas. In dogs, grain-free diets have been linked under investigation to certain heart conditions (dilated cardiomyopathy), and while the picture in cats is less defined, there is no established evidence that grain-free diets are categorically better. Look for foods that meet AAFCO nutritional standards rather than selecting by grain content alone. For comparison, see how this debate plays out in dogs: Grain-Free Diets for Dogs.

The idea that crunching kibble scrubs plaque from teeth has some intuitive appeal, but veterinary dental specialists have consistently found that dry food does not prevent periodontal disease in a clinically meaningful way. Most cats swallow kibble whole or with minimal chewing, and even when they do bite down, the contact between tooth and kibble is brief. Effective dental care for cats involves tooth brushing with cat-safe toothpaste, dental chews evaluated by the Veterinary Oral Health Council (VOHC), and regular professional cleanings as recommended by your vet.

The appeal of raw feeding rests on the idea that it mirrors what cats would eat in the wild. However, commercial raw diets and home-prepared raw meals have been found in multiple studies to carry pathogens including Salmonella, Listeria, and E. coli. These organisms can make cats ill and can also be transmitted to people, including immunocompromised individuals and children, through contact with the cat or its food preparation area. Major veterinary organizations, including the American Veterinary Medical Association (AVMA), advise against feeding raw animal-source proteins to pets. For a full breakdown of the evidence, see The Truth About Raw Pet Diets.

Some cats do modulate their intake well, but a significant portion do not — particularly indoor cats with limited activity. Unrestricted access to dry food is one of the leading contributors to feline obesity, which in turn increases risk for diabetes, joint disease, and urinary issues. Beyond weight management, scheduled meals allow owners to notice quickly when a cat's appetite changes — a meaningful early indicator of illness. Free-Feeding vs. Scheduled Meals for Cats explores the trade-offs in more detail. Your veterinarian can help determine the right feeding approach based on your cat's age, weight, and health status.