For anyone viewing this 15 years late like I am - Soy is not good for your cat. "My cat had some of my soya based yoghurt and is perfectly happy and healthy" Like ok- you can smoke meth and be perfectly happy and healthy, that isnt evidence of anything other than your lack of critical thinking. Small amounts once or twice in a blue moon is fine, but for cats Soy blocks the enzymes that are crucial in helping their body digest protein, consistently feeding them this is damaging their liver and will eventually cause it to fail. I would imagine those in this thread learned that the hard way considering its been 15 years. I understand this is a veggie board, but try not to spread misinformation, eh? Not the cats fault their owners are incompetent and they certainly don't deserve to die of liver failure because if it.