| U.S. pet food labeling standard | Set by AAFCO (Association of American Feed Control Officials) |
| "Complete and balanced" requirement | Must meet AAFCO nutrient profiles or pass feeding trials (AAFCO Official Publication) |
| Ingredient listing order | By descending weight before processing (includes moisture) |
| Essential amino acid unique to cats | Taurine — must be present in all complete cat foods (Veterinary consensus) |
| Unregulated marketing terms | "Premium," "gourmet," "natural" carry no defined nutritional standard (AAFCO guidelines) |
Why Cat Food Labels Are Confusing by Design
Pet food packaging is a mix of regulated terminology and marketing language — and the two don't always look different at a glance. Terms like "premium," "natural," or "gourmet" have no legal definition in pet food labeling and carry no nutritional guarantee. Meanwhile, terms like "complete and balanced" or "chicken meal" are precisely regulated by the Association of American Feed Control Officials (AAFCO), the body that sets pet food standards in the U.S.
Knowing which words are regulated — and what they actually require — is the most useful skill a cat owner can develop when shopping for food. This guide walks through the most common terms you'll encounter, so the label works for you, not against you.
| U.S. pet food labeling standard | Set by AAFCO (Association of American Feed Control Officials) |
| "Complete and balanced" requirement | Must meet AAFCO nutrient profiles or pass feeding trials (AAFCO Official Publication) |
| Ingredient listing order | By descending weight before processing (includes moisture) |
| Essential amino acid unique to cats | Taurine — must be present in all complete cat foods (Veterinary consensus) |
| Unregulated marketing terms | "Premium," "gourmet," "natural" carry no defined nutritional standard (AAFCO guidelines) |
Decoding the Ingredient List
Ingredients are listed in descending order by weight before processing. That means the first few ingredients make up the bulk of the food — but weight includes moisture, which can be misleading. A whole chicken listed first may outweigh a dry ingredient like chicken meal, but after cooking, that chicken loses most of its water weight.
AAFCO
The Association of American Feed Control Officials. A U.S. advisory body that establishes nutritional standards and labeling definitions for pet foods. Compliance with AAFCO profiles is the primary benchmark for whether a cat food is nutritionally complete.
Complete and balanced
An AAFCO-regulated claim meaning the food meets minimum nutrient requirements for a stated life stage. Foods bearing this label must have been formulated to AAFCO profiles or validated through feeding trials.
By-product
Animal-derived ingredients other than skeletal muscle meat, such as organs and bone. When named (e.g., 'chicken by-products'), AAFCO regulations exclude indigestible material like hair and hooves.
Meal (as in chicken meal)
A rendered, dried concentrate of a named protein source from which most moisture has been removed. Meal ingredients are typically higher in protein by weight than their fresh-meat equivalents.
Taurine
An amino acid that cats must obtain from their diet. Adequate taurine is critical for heart function and vision. AAFCO-compliant cat foods are required to contain sufficient levels.
Life stage
A required label declaration indicating which phase of a cat's life the food is formulated for: growth (kittens), maintenance (adults), all life stages, or supplemental use only.
When evaluating the ingredient list, look for named animal proteins (chicken, salmon, turkey) near the top rather than vague terms like "meat" or "animal." The more specific the source, the more traceable and consistent the ingredient tends to be. For a broader look at how ingredient lists work across food products, see our guide to reading ingredient lists.
Terms That Matter Most
By-products: These are parts of the animal other than skeletal muscle — organs, blood, bone, and similar material. In cat nutrition, organ meat like liver is nutrient-dense and appropriate. AAFCO-regulated by-products must not include hair, horns, hooves, or feathers. "Chicken by-product meal" specifically refers to dried, rendered chicken parts, concentrated in protein and nutrients. It is not inherently lower quality than whole meat — the source and processing matter more than the label alone.
Meal: A rendered, dried concentrate of a named protein source. "Salmon meal" contains several times more protein by weight than fresh salmon, because the water has been removed. It's a legitimate, high-protein ingredient.
Complete and balanced: This AAFCO phrase means the food has been formulated to meet minimum nutritional requirements for cats — either through nutrient profile analysis or feeding trials. A food labeled only as a "treat" or "supplement" does not meet this standard and should not be a cat's sole diet.
Life stage: Labels must state which life stage the food is appropriate for: growth (kittens), maintenance (adults), all life stages, or supplemental feeding. Kittens and pregnant or nursing cats have higher protein, fat, and caloric needs — a food labeled only for adult maintenance may not support them adequately. For more on how food format interacts with nutritional needs, see our comparison of wet food, dry food, and raw diets.
Additives, Preservatives, and What to Watch For
Preservatives keep fat from going rancid. Some are synthetic (BHA, BHT, ethoxyquin); others are natural (mixed tocopherols, vitamin C). Natural preservatives have shorter shelf lives but are generally preferred by veterinary nutritionists for long-term feeding. Neither type is categorically harmful at regulated levels, but if you have concerns, your veterinarian is the right resource.
Artificial colors serve no nutritional purpose — cats don't perceive color the way humans do. Their presence on a label is essentially a signal the food is styled for owner appeal, not cat benefit.
Taurine, an amino acid essential to cats, should appear in the ingredient list or guaranteed analysis. Unlike dogs and humans, cats cannot synthesize enough taurine on their own. Deficiency leads to serious heart and eye conditions. AAFCO-compliant complete-and-balanced foods must contain adequate taurine, so this is another reason the "complete and balanced" statement matters.
This article is for general informational purposes only and is not a substitute for veterinary nutritional advice. Consult your veterinarian before making significant changes to your cat's diet, especially for cats with health conditions or at sensitive life stages.