So what? It's not simply a matter of cutting calories or reducing fat to help an obese cat to trim down. Carbohydrates that are not used by carnivores are converted to and stored as fat. The so called 'light' diets that are on the market target the fat content as the nutrient to be decreased, but they've INCREASED the grain fraction, leading to a higher level of carbohydrates. That's why fat cats often don't trim down at all on the dry "light" diets.