How to Read Cat Food Ingredient Labels
Reading cat food ingredient labels is the first step in choosing quality food. According to AAFCO (Association of American Feed Control Officials) regulations, ingredients must be listed in descending order by weight. This means the first ingredients listed make up the largest proportion of the product. Understanding this basic principle helps cat owners quickly assess food quality.
Freeman et al. (2013), published in the Journal of the American Veterinary Medical Association, identified several key points for reading ingredient labels:
- First five ingredients: These form the foundation of the food; ideal cat food should list an animal protein first
- Named meats vs. by-products: "Chicken" is preferable to "poultry"; named sources offer greater transparency
- Meat meal: Such as "chicken meal", a dehydrated concentrated protein source that actually contains more protein than fresh meat by weight
- Grains and carbohydrates: Cats are obligate carnivores with extremely low carbohydrate requirements (Zoran, 2002)
- Guaranteed analysis: Pay attention to crude protein, crude fat, crude fiber, and moisture percentages
Essential Nutritional Additives
Not all additives are harmful. In fact, many additives are essential for ensuring cats receive complete nutrition. The NRC (2006) in Nutrient Requirements of Dogs and Cats clearly states that processed foods may lose certain nutrients during manufacturing, necessitating supplementation through additives.
| Additive Category | Common Name | Function |
|---|---|---|
| Taurine | Taurine | Essential amino acid for cats; deficiency causes cardiomyopathy and blindness |
| Vitamin A | Vitamin A supplement | Cats cannot convert beta-carotene; must be supplemented directly |
| Vitamin D3 | Cholecalciferol | Maintains calcium-phosphorus balance and bone health |
| Vitamin E | Mixed tocopherols | Antioxidant that also serves as a natural preservative |
| Arachidonic acid | Arachidonic acid | Essential fatty acid cats cannot synthesize on their own |
| Chelated minerals | Zinc proteinate, etc. | More bioavailable mineral forms |
The presence of these additives is actually an indicator of quality, showing that the manufacturer prioritizes nutritional completeness.
Controversial Additives
Certain additives have differing opinions in both the scientific community and among consumers:
- Carrageenan: Commonly used as a thickener in wet food. Some in vitro studies (Tobacman, 2001) suggest it may trigger intestinal inflammation, but AAFCO and the FDA currently classify food-grade carrageenan as safe. Owners may choose to avoid it based on personal judgment
- Guar gum: A natural thickener generally considered safe. Rare reports suggest it may affect nutrient absorption at very high doses
- Soy protein: Can provide protein, but some cats may be allergic to soy. Cats also utilize plant-based proteins less efficiently than animal-based proteins
- Corn gluten meal: High in protein but plant-based; sometimes used to inflate protein content numbers on labels
Additives to Avoid
The following additives are generally advised against by veterinary professionals or have documented safety concerns:
- BHA / BHT: Synthetic antioxidants. While the FDA permits low-dose use, the IARC (International Agency for Research on Cancer) classifies BHA as a possible carcinogen (Group 2B). Natural alternatives such as vitamin E (mixed tocopherols) are equally effective
- Ethoxyquin: Once widely used as a feed preservative but has been largely phased out due to safety concerns. Most premium brands no longer use it
- Propylene glycol: The FDA has explicitly banned its use in cat food because feline red blood cells are particularly sensitive to this compound, which can cause Heinz body anemia
- Artificial colors (e.g., Red 40, Yellow 5): Provide zero nutritional value and are added purely for appearance. Some studies suggest potential adverse health effects
- Excessive salt and sugar: Enhance palatability but may negatively impact cardiovascular and metabolic health
Principles for Choosing Quality Cat Food
Based on the analysis above, the WSAVA (World Small Animal Veterinary Association) Global Nutrition Guidelines recommend the following principles when selecting cat food:
- Confirm AAFCO Complete and Balanced certification: The label should state "Complete and Balanced"
- Choose named animal protein as the first ingredient: Such as chicken, salmon, or turkey
- Prefer natural preservatives: Such as mixed tocopherols (vitamin E) or rosemary extract
- Avoid unnecessary artificial additives: Artificial colors and flavors offer no nutritional benefit
- Check manufacturer credentials: Responsible brands employ animal nutritionists and conduct feeding trials
- Adjust based on individual needs: Age, health status, and activity level should all be considered
Ultimately, the best food is one that suits your cat and helps maintain a healthy body condition and good overall wellbeing. If in doubt, consult a veterinarian or a board-certified veterinary nutritionist.
References
- Freeman, L.M., Chandler, M.L., Hamper, B.A., & Weeth, L.P. (2013). Current knowledge about the risks and benefits of raw meat-based diets for dogs and cats. Journal of the American Veterinary Medical Association, 243(11), 1549-1558.
- Zoran, D.L. (2002). The carnivore connection to nutrition in cats. Journal of the American Veterinary Medical Association, 221(11), 1559-1567.
- National Research Council (NRC). (2006). Nutrient Requirements of Dogs and Cats. The National Academies Press.
- Tobacman, J.K. (2001). Review of harmful gastrointestinal effects of carrageenan in animal experiments. Environmental Health Perspectives, 109(10), 983-994.
- WSAVA Global Nutrition Committee. (2021). WSAVA Global Nutrition Guidelines. World Small Animal Veterinary Association.
- AAFCO. (2025). Official Publication. Association of American Feed Control Officials.