I have two 14 month old cats who have been eating Purina pro-plan their whole life. Last month, we adopted a kitten, and my wife decided that it was the right time to feed our three cats a more healthy,balance and gluten free food. So she started to feed them Natural Balance instead of Purina. The kitten loved it, but my other 2 cats went in starvation mode for one week. It has been one month already. We have tried Wellness, Merricks, Avoderm and Blue Spa, but they just won't eat it anything that doesn't taste like Purina Pro-plan. We bought dry Natural Balance, and that's the only thing they eat, but we don't want to feed then dry food only. We have tried all tricks possible. We have mixed the dry and wet food, spoon feeding, warming the food, adding gravy, etc. Are we doing something wrong. Are they addicted to Purina? We don't want to feed them Purina anymore. Please help us.