This is because most cats have some degree of intolerance to the high amount of carbohydrates in most of the commercial diets available, including most if not all prescription diets. (feline-nutrition.org)
Studies also show that the total amount of carbohydrate in food, in general, is a stronger predictor of blood glucose response than the GI. (diabetes.org)
However, highly processed white rice, and refined carbohydrates in general, is void of nutrition and can cause inflammation since it quickly turns into sugar within the body. (globalhealingcenter.com)