I tried this food because one of our cats was sometimes going potty where he shouldn't. I thought maybe he had crystals in his urine so it hurt to go potty and he was looking for a softer place to go potty other than the litter box. I heard that some types of cat food may cause crystals and so I decided to try a urinary tract formula (it must be a fairly common problem if there is a special food for it).The problem seems to have gone away now that he is eating the Purina One Special Care Urinary Tract Health Formula. He's been eating this as his main food for about a year and, so far, so good.