hill's Prescription Diet m/d cat has been specifically created to manage diabetic problems in cats.

Their recipe, low in fat and calories, but high in fiber, helps your cat lose weight.
hill's Prescription Diet m/d Diabetes/Weight Management also contains more L-carnitine and L-lysine than traditional dietetic cat foods, substances that help burn fat better and maintain lean muscle mass.

Contraindications:

• food not suitable for kittens
• do not administer during pregnancy or breastfeeding
• renal insufficiency

Ingredients:
vegetable protein extracts, meat and animal by-products, cereals, oils and fats, vegetable by-products, minerals. 
Source of carbohydrates: wheat.
Additives:
Physiological-nutritional additives:
Vitamin A (26,496 IU/kg), Vitamin D3 (1,395 IU/kg), Iron (141 mg/kg), Iodine (2.1 mg/kg), Copper (17.9 mg/kg), Manganese (6.2 mg/kg), Zinc (120 mg/kg), Selenium (0.3 mg/kg). 
With natural antioxidants.