Oh, I love that - greyscale as a warning.
For a while I had my whole phone on greyscale, but I don’t have trouble with spending time on my phone - it’s really the laptop that I have an issue with.
Maybe I should write software to conditionally greyscale my desktop/laptop screen!
Thanks for the link and details, so helpful!
The reason cats can’t be vegan is that they cannot produce an amino acid called taurine, which is something dogs and humans can produce (but which we also get sometimes from dietary sources).
Most dietary sources of taurine are meat. This is why dogs and humans “can be vegan” but cats “can’t”. However, vegan taurine is made and can be bought as a supplement, both for humans (if you want to ensure you get some taurine in your diet), but also in properly made vegan cat food.
It seems to me then that cats can be vegan, just not without intentional effort to ensure proper supplementation of taurine. That is, they couldn’t be vegan in the wild (where the only source of taurine is meat) and you can’t just start to feed them a vegan diet without taurine and expect the cat to be healthy and survive.
In fact, cats fed a proper vegan diet tend to have better health:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10499249/
I think the question is really what you are feeding your “vegan” cat: if you have managed to find (or make) a properly fortified vegan cat food it is theoretically possible to feed your cat a vegan diet.
This all feels a bit like the “controversy” around feeding young children and babies a vegan diet: done poorly it can be catastrophic (pun not intended), but it’s entirely possible to have a healthy vegan diet when enough effort is put into ensuring nutritional needs are actually satisfied.
That said, I also know of two other vegan responses: