Until more research is undertaken, we do not yet know what the implications of feeding your cat a vegan diet will be. We strongly recommend feeding your cat a diet that meets PFMA (Pet Food Manufacturers Association) guidelines and to speak to your vet if you have any questions.
https://www.bluecross.org.uk/advice/cat/food-and-weight/can-cats-be-vegan
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Can cats be vegan?
Bluecross dot org dot uk