PlAnTs FeEl PaIn!!1!!!
I wouldn't worry about it. Their doctor is going to prescribe them a steak very shortly.
I asked my vet what she thought about cats being fed a vegan diet, and she said she didn't have a problem with it because they do that for cats with allergies already. Although taurine is a legitimate issue.
I wouldn't worry about it. The British government said they were working on cows that fart less. Once they've done that, we can just go back to eating ethically-murdered beef.