Thanks to all for your answers about Oreo's food.
Another question. About a month ago, my 12 year old diabetic cat, Oreo, was hospitalized (vet and hospital on same premises) because he was vomiting after he ate. It was the color of his DM Purina food. Vet felt he should be hospitalized. He was in hospital for 4 days, on iv, xrays, blood work, etc. They couldn't find anything. The vet said he never vomited. Cost - close to $2,000 for 4 days for procedures and boarding.