Cats are different.
Plant based proteins lack all the individual building blocks of the amino acid profile required by carnivores. For example, we know Taurine is a key amino acid nutrient for cats - and it simply doesn't exist in plant matter.
Humans can take the different pieces of the protein puzzle from plants get what's required to live.
Dry food (kibble) is almost invariably based on plant proteins - so while the AMOUNT of protein listed on the label might look plenty high, most of it is not biologically AVAILABLE to a carnivore.
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Plant matter is a very poor source of taurine, a critical amino acid essential for normal heart and vision function in a cat.
The best available information I can unearth reveals that a small cat's "perfect" nutrition package - a mouse - contains a very high amount of taurine relative to other meats - approximately 2.4 mg/gram. The good news is that taurine is present in most raw meat muscle meat, but it is abundant in the heart and brain. Chicken hearts are a fantastic source of taurine if you're making cat food.
(FYI, I procure chicken hearts in bulk from a really great place in PA called Hare Today Gone Tomorrow - they ship the hearts in 2-lb packages, frozen, right to the door. The packages always arrive in great shape and I use a small chest freezer to store the packages until food-making day.)
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