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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