What Ingredients to Avoid in Cat Food

Not all cat food is created equal. While most commercial cat foods meet basic nutritional standards, some contain ingredients that offer little nutritional value — or worse, may harm your cat's health over time. Knowing what to avoid helps you make smarter choices at the pet store.

1. Artificial Preservatives

Artificial preservatives extend shelf life but come with health concerns:

• BHA (Butylated Hydroxyanisole) – Listed as a possible carcinogen by the National Institutes of Health
• BHT (Butylated Hydroxytoluene) – Similar concerns as BHA
• Ethoxyquin – Originally developed as a pesticide; banned in human food in many countries
• Propyl Gallate – Linked to liver damage in some studies

Look for foods preserved naturally with Vitamin E (mixed tocopherols) or Vitamin C (ascorbic acid) instead.

2. Artificial Colors and Flavors

Cats don't care what color their food is — artificial dyes like Red 40, Yellow 5, and Blue 2 are added purely for human appeal. They provide zero nutritional benefit and have been linked to behavioral issues and allergic reactions in some animals. Similarly, artificial flavor enhancers mask the taste of low-quality ingredients.

3. Generic Meat By-Products

"Meat by-products" or "animal by-products" without a named species (e.g., "chicken by-products" is acceptable; "meat by-products" is not) can include low-quality parts from unknown sources. Named organ meats like chicken liver are actually nutritious — the problem is the vague, unspecified versions.

4. Carrageenan

Carrageenan is a thickening agent derived from seaweed, commonly found in wet cat food. While it's technically "natural," research has linked it to intestinal inflammation, ulcers, and even cancer in animal studies. Many premium brands have removed it from their formulas. Check the ingredient list of any wet food carefully.

A safer wet food option is Fancy Feast Classic Pate Grain Free Variety Pack, which offers a range of flavors without unnecessary additives.

5. Excessive Fillers

Cats are obligate carnivores and have limited ability to digest large amounts of carbohydrates. Watch out for:

• Corn syrup – Adds empty calories and can spike blood sugar
• Wheat flour / corn starch – Cheap fillers with minimal nutritional value for cats
• Soy – A common allergen for cats; also a cheap protein substitute
• Cellulose – Essentially wood pulp used as a fiber filler

6. Unnamed Protein Sources

Ingredients like "meat meal," "poultry meal," or "animal digest" without a named species are red flags. You don't know what animal the protein came from, which makes quality control impossible. Always look for named proteins: "chicken meal," "salmon meal," "turkey meal."

7. Propylene Glycol

Used as a humectant in some semi-moist cat foods, propylene glycol is actually banned in cat food by the FDA because it can cause Heinz body anemia in cats. It's still allowed in dog food, so double-check if you ever share products between pets.

8. Onion, Garlic, and Chives

These are toxic to cats and should never appear in cat food. They damage red blood cells and can cause anemia. While rare in commercial cat food, always check if you're buying flavored or "gourmet" varieties.

9. High Salt Content

Excessive sodium can contribute to high blood pressure and kidney stress in cats, especially seniors. While some sodium is necessary, avoid foods where salt appears high on the ingredient list.

10. Melamine and Contaminated Ingredients

While not an ingredient you'd see listed, it's worth buying from brands with strong quality control and transparent sourcing. The 2007 melamine contamination scandal that killed thousands of pets originated from imported ingredients with no oversight. Stick to brands that manufacture in the USA, Canada, Australia, or the EU where regulations are stricter.

Better Alternatives

If you want to avoid problematic ingredients, look for limited ingredient diets. Natural Balance Limited Ingredient Diet Green Pea & Salmon is a grain-free option with a short, clean ingredient list — ideal for cats with sensitivities or owners who want full transparency about what's in their cat's food.

The Bottom Line

You don't need to memorize every ingredient, but knowing the key red flags — artificial preservatives, carrageenan, unnamed proteins, and excessive fillers — puts you miles ahead of the average cat owner. When in doubt, choose brands that are transparent about their sourcing and manufacturing, and always check the AAFCO statement for nutritional completeness.