What is the best diet for a diabetic cat? Published May 13, 2017 at 408 × 408 in What is the best diet for a diabetic cat? Obesity is caused by dry cat food some vets will argue and neutering male cats puts them at risk if on dry cat food it is also said. If on dry food take your cat off and prescrible wet food only. Please comment here using either Facebook or WordPress (when available).