Hill'S Prescription Diet W/D Feline Low Fat - Glucose Management Gastrointestinal - 4Lb Low in calories to help maintain weight once cats have achieved their ideal weight. High levels of carnitine to increase energy metabolism and burn fat while increasing lean muscle mass. Low fat to help diabetic cats maintain appropriate weight. Moderately high fiber levels provide a feeling of fullness. Added antioxidants to support a healthy immune system.