Our 12 month-old kitten will be a 1 year-old next week. He's been eating dry Nutra Pro Max for Kittens (or something like that). We got him when we was just 7 months old. He was skinning as a rail when we picked him up from the Humane Society but now he's turned into kind of a fat cat. We're going to move him to the Nutra Pro Max for Adults. Will the "adult" cat food be a little better for him weight-wise than the kitten food he's been on? I'm thinking, and maybe I'm wrong, that the kitten food was pretty fatty and might be one of the reasons he's a little on the "fatty" side. We've been feeding him according the instructions on the sack. Or should we get him the "diet" bag?