Cat food labels are designed to be persuasive, not necessarily easy to interpret. Two practical things actually help: understanding the guaranteed analysis panel, and understanding what ingredient order does and doesn't tell you.
The Guaranteed Analysis Panel
Every commercial cat food is required to list minimum percentages of crude protein and crude fat, and maximum percentages of crude fiber and moisture. This is useful, but it comes with a real limitation: these numbers are reported "as fed," meaning a wet food's numbers look much lower than a dry food's simply because wet food is roughly 75-80% water and dry food is roughly 10% water. Comparing a wet food's 8% protein to a dry food's 30% protein without adjusting for moisture content is comparing different things.
The fix is converting to a "dry matter basis" — dividing each nutrient percentage by (100 minus the moisture percentage), then multiplying by 100. Once you do this, wet and dry foods become genuinely comparable, and the numbers often look much closer than the "as fed" panel suggests.
What Ingredient Order Does and Doesn't Tell You
Ingredients are listed by weight before cooking, which creates a specific quirk: a fresh meat listed first contains a lot of water weight that cooks off, while a dry ingredient listed lower (like a specific protein meal) may actually contribute more protein to the finished food than the "first ingredient" does. This doesn't mean ingredient order is meaningless — it's a genuine starting signal — but a single named "first ingredient" isn't as decisive a piece of information as marketing often implies.
What Actually Matters More
For most healthy cats, the specific brand matters less than: an AAFC-equivalent statement confirming the food is complete and balanced for your cat's life stage, an appropriate protein and fat level for that life stage, and — separately from the label itself — whether your cat actually does well on it (stable weight, good coat, normal stool, no digestive upset). A food that looks impressive on paper but that your cat won't reliably eat, or that causes soft stool, isn't actually the better choice for your cat specifically.
When to Look Closer
If your cat has a diagnosed medical condition (kidney disease, diabetes, urinary issues), a general "which food is best" comparison stops being the right question — your vet's specific therapeutic diet recommendation for that condition should take priority over general label-reading, since these diets are formulated around that condition's specific nutritional needs.
This is educational information, not a specific brand recommendation — see the Nutrition Center for our general food category guide and calorie calculator, and talk to your vet about what's right for your individual cat.