It seems like every food I buy is fine - maybe - for about a 4 lb bag then they start having stool problems. And that is about 2lbs per cat - 2 cats.... I have tried Natural Balance, Purina One, and Nutro Natural Adult, and Nutro MaxCat which they both promptly threw up in front of me so I guess that is out... haha So what all do you feed your cats? Your help - these bags cost a lot and I'm tired of trying and trying so I need your help on which ones are best for your cats.. Thanks so much!!! Debbie