I have to say I'm relieved to see I am not the only one whose cat has reacted badly to this food...so I know it is the food and not necessarily my cat. I switched my cat to this food about 5 weeks ago, and three weeks ago he became horribly constipated and was in and out of the vet for a good two weeks...now the last few days, although he's been feeling a lot better now he has almost constant diarrhea. Needless to say I am taking him off Wellness. He seems to like the taste, but the mess and vet bills are not worth it!