Why Should You Learn to Read Cat Food Labels?
Pet food labeling regulations vary by country, but in general, all commercially sold pet foods must display specific information on their packaging. However, the professional terminology and data formats on labels often confuse cat owners. Learning to interpret this information will help you make better dietary choices for your cat.
How to Read the Ingredient List
According to AAFCO (Association of American Feed Control Officials) regulations, ingredients must be listed in descending order by weight. This means the first ingredient listed is the one present in the largest quantity in the product.
Key Points to Watch For:
- Meat should be among the first few ingredients: Cats are obligate carnivores. According to the NRC (National Research Council, 2006) publication Nutrient Requirements of Dogs and Cats, cats have protein requirements far higher than most mammals. At least one clearly identified meat source should appear within the first three ingredients.
- Distinguish between meat labels: "Chicken" and "chicken meal" are different — whole chicken contains about 70% water, so its actual content decreases significantly after drying; chicken meal has already been dehydrated and has a relatively higher protein content.
- Avoid vague labeling: Ingredients such as "meat by-products" or "animal fat" that do not clearly identify the source are difficult to assess for quality.
Guaranteed Analysis
The Guaranteed Analysis is typically displayed on an "as-fed basis", meaning it includes moisture content. This makes it difficult to directly compare dry food and wet food.
For a fair comparison, you need to convert to "dry matter basis" (DMB):
| Step | Formula | Example (canned food with 78% moisture) |
|---|---|---|
| 1. Calculate dry matter percentage | 100% - moisture% | 100% - 78% = 22% |
| 2. Convert protein (DMB) | protein% ÷ dry matter% | 10% ÷ 22% = 45.5% |
| 3. Convert fat (DMB) | fat% ÷ dry matter% | 5% ÷ 22% = 22.7% |
AAFCO Nutritional Adequacy Statement
The AAFCO Nutritional Adequacy Statement is a key indicator for determining whether a food product can serve as a "complete and balanced diet".
- "Complete and Balanced": Indicates the product meets AAFCO nutritional standards and can be used as the sole food source.
- Applicable life stage: Common labels include "All Life Stages," "Adult Maintenance," and "Growth" (for kittens).
- "For Supplemental Feeding Only": Indicates the product is not suitable as the sole food source and is typically a complementary food or treat.
Important note: Some imported pet foods may follow the EU FEDIAF standards rather than AAFCO. The nutritional standards of both are broadly similar but have slight differences. Check the packaging for the applicable standard when purchasing.
Common Additives Explained
| Additive Name | Purpose | Safety |
|---|---|---|
| Guar Gum | Thickener | AAFCO approved, generally recognized as safe |
| Xanthan Gum | Thickener | AAFCO approved, generally recognized as safe |
| Carrageenan | Thickener | AAFCO approved, but somewhat controversial |
| Taurine | Essential amino acid supplement | Essential for cats; deficiency can lead to heart disease and retinal degeneration |
| Vitamin E (Mixed Tocopherols) | Natural antioxidant | Safe; preferable to artificial antioxidants |
| BHA / BHT | Artificial antioxidants | Permitted by AAFCO, but some studies raise safety concerns |
Regarding taurine, according to the landmark study published in the Journal of the American Veterinary Medical Association (Pion et al., 1987), taurine deficiency can cause dilated cardiomyopathy (DCM) in cats. This is why all cat food formulas must include adequate amounts of taurine.
Quick Shopping Checklist
- Are the first three ingredients clearly identified meat sources?
- Does it carry an AAFCO or FEDIAF "Complete and Balanced" statement?
- Is the guaranteed analysis clearly displayed (protein, fat, fiber, moisture)?
- Are the manufacturer and country of origin listed?
- Is the product within its expiration date?
- If it is a staple diet, is it appropriate for your cat's life stage?
References
- National Research Council (NRC). (2006). Nutrient Requirements of Dogs and Cats. The National Academies Press.
- Association of American Feed Control Officials (AAFCO). Official Publication, Pet Food Regulations.
- Pion, P.D. et al. (1987). Myocardial failure in cats associated with low plasma taurine: A reversible cardiomyopathy. Science, 237(4816), 764-768.
- FEDIAF (European Pet Food Industry Federation). Nutritional Guidelines for Complete and Complementary Pet Food for Cats and Dogs.