If you read the back of a popular cat food packet with the same eye a food quality professional uses at work, some of what you find is genuinely surprising. Not because cat food is uniquely bad — much of it is fine — but because the same labelling techniques that obscure quality in human food appear in pet food too, and cats can’t read the label or complain about what’s in the bowl.

I have four cats and 20 years in food quality. This is a plain-language guide to the ingredients I look for and question when I read a cat food label — what they are, why they’re used, and what their presence tells you about a product.

1. Unnamed meat: “meat and animal derivatives”

This is the single most informative phrase on a cat food label — informative precisely because of how little it tells you. “Meat and animal derivatives” is a category, not an ingredient. It can include a wide and variable range of animal materials, and crucially, the exact composition can change from batch to batch depending on what’s available and cheap at the time.

Compare this to a named source: “chicken” or “chicken (45%).” A named, quantified protein tells you what your cat is actually eating and in what proportion. “Meat and animal derivatives” tells you only that some animal material is present. The vaguer the term, the less the manufacturer is committing to — and the more flexibility they retain to use lower-cost inputs.

2. Artificial preservatives: BHA, BHT, and ethoxyquin

BHA (butylated hydroxyanisole) and BHT (butylated hydroxytoluene) are synthetic antioxidants used to prevent fats in pet food from going rancid. Ethoxyquin is another synthetic preservative sometimes used, particularly in fish meal. These preservatives are effective at their job and are permitted within regulatory limits, but they’re exactly the kind of synthetic additive that quality-focused brands have moved away from.

The reason to note them: natural alternatives exist and are widely used by better products. Tocopherols (vitamin E) and rosemary extract preserve fats effectively without synthetic compounds. When a brand chooses BHA or BHT over these, it’s typically a cost decision. Their presence signals a product optimised for shelf life and price rather than for the cleanest possible formulation.

3. Artificial colours

Here’s a fact that says everything: cats are nearly colourblind in the way that matters here, and they choose food by smell, not appearance. Artificial colours in cat food serve no purpose for the cat whatsoever. They exist entirely to make the product look more appealing to the human buying it — reddish chunks that suggest meat, varied colours that suggest variety.

The colours themselves (often the same synthetic dyes scrutinised in human food) aren’t necessarily harmful at the levels used. But their presence is a pure tell: this product was formulated with the human’s visual perception in mind rather than the cat’s actual needs. A product that adds dye to impress you is telling you about its priorities.

4. Excess carbohydrates and fillers

Cats are obligate carnivores with limited ability to use carbohydrates, yet many dry cat foods contain 30–50% carbohydrate, often from corn, wheat, rice, or potato. These serve to bind kibble, add cheap calories, and extend shelf life — not to nourish the cat. Some carbohydrate is unavoidable in dry food manufacturing, but a product where grains or starchy fillers appear high in the ingredient list is prioritising production economics over feline biology.

Watch also for “ingredient splitting” — where a single grain is divided into multiple listed components (e.g. “ground corn,” “corn gluten meal,” “corn bran”) so that no single corn entry ranks above the meat, even though the combined corn content may exceed it. This is the same trick used with sugar in human food.

5. Menadione (synthetic vitamin K3)

Menadione sodium bisulfite — a synthetic form of vitamin K — appears in some cat foods, often listed in fine print as “vitamin K3” or “menadione sodium bisulfite complex.” It’s a topic of ongoing debate in pet nutrition. While used within permitted limits, it’s a synthetic form that some quality-focused brands deliberately avoid in favour of natural vitamin K sources. Its presence, like BHA/BHT, tends to correlate with a cost-optimised formulation rather than a premium one.

6. Carrageenan

Carrageenan is a thickener derived from seaweed, used in many wet cat foods to achieve a particular texture. It’s a subject of ongoing scientific discussion regarding digestive effects, with some studies raising questions and others finding it benign at typical levels. The evidence isn’t conclusive either way. It’s worth knowing it’s there and being aware of the debate — particularly for cats with sensitive digestion — rather than treating it as either definitely harmful or definitely fine.

The realistic takeaway

You don’t need to find a cat food with a perfect label — those are rare and often very expensive. The goal is to read the label well enough to make an informed choice within your budget, and to avoid the products that are clearly optimised for cost and human appeal over feline nutrition.

The single most useful habit: turn the packet over and read the actual ingredient list, not the marketing on the front. A bag covered in words like “premium,” “natural,” and “gourmet” tells you nothing. The ingredient list tells you everything. If the first ingredient is a named meat and you don’t see the items in the left column above, you’re likely looking at a reasonable product regardless of what the front says.