Nutritionists have investigated the diet and regulation of consumption in many species, including cats. In this study, investigators examined various dietary factors in cats fed different commercial cat foods with differing .nutrient composition. Cats appear to be limited in the amount of carbohydrate they can digest. High carbohydrate intake may in fact cause gastrointestinal problems in cats, and leads to reduced protein and fat intake. It is not clear how cats regulate their intake normally, whether through consumption or their metabolism. Further research is needed to determine which dietary factors contribute to the nutrient regulation in cats. [MK]Related articles:Zoran D: The carnivore connection to nutrition in cats, J Am Vet Med Assoc 221:1559, 2002.