Commercial cat food is built around animal protein, with chicken, turkey, beef, and fish as the most common sources. Because cats are obligate carnivores, their food must deliver substantially more protein than dog food: at least 26% protein on a dry-matter basis for adult cats, compared to 18% for dogs. Beyond that protein core, cat food contains fats, small amounts of carbohydrates, added vitamins and minerals, and various processing aids that differ depending on whether the food is dry kibble or wet canned.
Why Meat Is the Foundation
Cats have higher requirements for protein, taurine, arachidonic acid (a fatty acid found in animal tissue), niacin, vitamin A, and vitamin D than omnivores like dogs or humans. Their bodies are less efficient at synthesizing these nutrients from plant sources, so animal-based ingredients do most of the heavy lifting. That said, cats need nutrients, not specific ingredients. A food formulated with the right balance of amino acids, fats, and vitamins can meet a cat’s needs even if some of those nutrients come from non-meat sources.
Animal Protein Sources
Chicken and turkey are the most widely used proteins in commercial cat food. You’ll also see beef, salmon, tuna, lamb, and occasionally rabbit. These appear on labels in several forms. “Chicken” or “turkey” listed as an ingredient typically means muscle meat. “Chicken meal” is the same tissue with the water removed and ground into a concentrated powder, which actually packs more protein per gram than whole meat.
By-products are another common ingredient, and the name sounds worse than the reality. By-products include organ meats like liver, kidney, and spleen, parts that a wild cat would eat instinctively. Liver in particular is rich in vitamin A and iron. A mix of muscle meat and some organ-based by-products closely mimics what a cat would consume in nature.
Fats and Oils
Cat food requires a minimum of 9% fat on a dry-matter basis for both kittens and adult cats. Chicken fat and fish oil are the most common sources. Fat provides concentrated energy, carries fat-soluble vitamins, and supplies arachidonic acid, which cats cannot produce on their own. It also plays a major role in palatability. During manufacturing, fat or flavor coatings are often sprayed onto kibble after cooking to make the food appealing.
Carbohydrates and Fillers
Dry cat food almost always contains some carbohydrate source. Corn, wheat, rice, barley, peas, lentils, potatoes, and tapioca are all used. These serve a dual purpose: they provide energy and, just as importantly, they give kibble its structure. Without starch, the extrusion process that forms kibble into its characteristic shapes wouldn’t work. Grain-free formulas substitute legumes or potatoes for traditional grains but still contain comparable carbohydrate levels.
Wet food generally contains fewer carbohydrates because it doesn’t need starch to hold its shape. Instead, canned formulas rely on gelling and thickening agents like carrageenan, agar-agar, and guar gum to create the familiar pâté, chunks-in-gravy, or shredded textures.
Vitamins, Minerals, and Supplements
Even with high-quality meat as the base, raw ingredients alone rarely deliver every nutrient in the right proportion. Manufacturers add a vitamin and mineral premix to fill the gaps. A typical premix for cats includes calcium, phosphorus, potassium, zinc, iron, copper, manganese, magnesium, and sodium. Taurine, the amino acid cats famously cannot produce enough of on their own, is added separately. B vitamins like thiamin are supplemented as thiamin mononitrate or thiamin hydrochloride, and vitamin E is included both as a nutrient and as a natural preservative.
Preservatives
Dry cat food needs protection against fat going rancid over months of shelf life. Synthetic preservatives like BHA, BHT, and ethoxyquin have been used for decades and are effective in small amounts. Many brands have shifted toward natural alternatives: vitamin E (listed as “mixed tocopherols”), vitamin C (ascorbic acid), and rosemary extract. These work through the same antioxidant mechanism but break down faster, which is one reason naturally preserved foods have shorter shelf lives. Wet food sealed in cans or pouches is sterilized during processing, so it relies less on chemical preservatives and more on the airtight seal itself.
How Dry Food Is Made
Dry kibble starts as a mix of ground meat or meat meal, grain or starch, and dry vitamin and mineral powders. This dry blend gets combined with wet ingredients, water, and steam in a preconditioner, which hydrates everything into a dough and begins cooking. The dough then enters an extruder, a machine that cooks it under high pressure and heat. At the end of the extruder, the cooked dough is forced through a die plate that shapes it into ribbons, which a rotary cutter slices into individual kibble pieces. As the pieces exit, the sudden drop in pressure causes them to puff and expand.
After cutting, the kibble passes through an oven to dry out (finished kibble is only about 3% to 4% moisture) and then gets cooled. The final step is coating: kibble enters a revolving drum where it’s sprayed with a mix of fats, flavors, and preservatives. This outer layer is largely what makes a cat interested in the food.
How Wet Food Differs
Canned cat food is roughly 78% to 82% moisture, meaning most of what’s in the can is water. The remaining 18% to 22% is a concentrated mix of meat, organs, gelling agents, and added nutrients. Ingredients are blended and cooked, then sealed into cans or foil pouches and heat-sterilized. Because the water content is so high, wet food delivers fewer calories per bite than kibble, which is one reason cats eating wet food often maintain a leaner body weight.
The texture differences between pâté, chunks in gravy, and shredded styles come down to how the meat is processed before canning and which thickening agents are used. Carrageenan, derived from seaweed, creates a firm gel. Guar gum, from a legume, produces a thicker gravy. Some formulas use a combination of both.
Reading the Label
Ingredients are listed in descending order by weight before processing. Because whole chicken is about 70% water, it weighs a lot and lands high on the list, but once cooked and dried it contributes less actual protein than “chicken meal,” which has already had the water removed. A food listing chicken meal as its first ingredient may contain more animal protein than one listing whole chicken first.
Any cat food labeled “complete and balanced” in the United States has been formulated to meet nutrient profiles set by AAFCO, which specify minimums for protein, fat, vitamins, and minerals at two life stages: growth and reproduction (kittens and pregnant cats) and adult maintenance. Kitten food requires at least 30% protein on a dry-matter basis, while adult food requires 26%. If a product carries an AAFCO statement, it has either been formulated to meet these profiles or undergone feeding trials to confirm cats thrive on it.