Possible allergic reaction
My cat's been on this food for over a year now and with this recent purchase, he's been ill – vomiting and loose stools. I suspect he's either developed an allergy to it or something about the food has changed. Will be trying out different varieties by the company to see if they're any better or will switch to a different brand entirely.
There were no issues with previous purchases. He's a ragdoll and it gave him a gorgeous coat, lots of energy and healthy eyes and teeth.