I can't 100% say this was the reason but I should have done better research. Our cat just got home from the hospital due to having a urinary blockage. And for some reason even though Wellness brand is a great quality cat food, this brand has caused hundreds of pet owner's cats urinary problems. I only feel like this is true because our cat was doing great with his other food and then him being on this for a month and a half seems to have caused crystals in his bladder.