This reminds me of cat foods' recommended portions. With my previous 2 cats, one pigged out and gained weight but the other cat didn't. Since both were about

This reminds me of cat foods' recommended portions. With my previous 2 cats, one pigged out and gained weight but the other cat didn't. Since both were about the same body size (length & height), I decided to measure how much the non-overeater was eating and feed that to both cats every day. It worked great. What was amazing was how little food they really needed (both were indoor-only). I was feeding them about half of what the bag said to feed them based on their weight. If the bag says to feed 1 cup per 15 lbs for example, it's a good bet they will gain weight. And the solution according to the bag's guidelines? Feed them 1.25 cups of course, because bigger animals need more food! Sheesh, what a racket...