Iams is made up of "meat and animal derivitves" and "derivitves of a vegetable origin" is that something you'd eat yourself ?
Purely kitten contains :Composition and Nutrition: Composition: Poultry Meal (25%), Chilled Chicken (18%), Maize Meal, Rice, Fish Meal, Poultry Fat, Maize Gluten Meal, Yeast, Linseed Meal, Sugar Beet Pulp, Omega 3 Oil, Chicken Gravy, Minerals, Seaweed Meal, Herbs (Couch, Kelp and Nettle), Oatmeal, Barley Meal. Technological Additives: None stated; Sensory Additives: Colourants; Nutritional Additives: Vitamin A 14,000iu/kg, Vitamin D3 1250iu/kg, Vitamin E (alpha sign Tocopherol) 100mg/kg, Zinc Sulphate Monohydrate 278mg/kg, Ferrous Sulphate Monohydrate 200mg/kg, Manganese Sulphate Monohydrate 94mg/kg, Cupric Sulphate Pentahydrate 20mg/kg, Sodium Selenite 5mg/kg, Calcium Iodate Anhydrous 1.5mg/kg. Analytical Constituents: Protein 32%, Crude Fibres 2%, Crude Oils and Fats 16%, Crude Ash 9%, Moisture 10%.
Cats don't need and can't process Maize or Poultry meal ( another name for grain)