Neutering changes a cat's metabolism. Royal Canin Sterilised 37 dry food has been specially formulated for this purpose. Ingredients: poultry protein (dehydrated), maize, vegetable protein isolate*, lignocellulose, animal fats, animal protein (hydrolyzed), rice, wheat, dehydrated beet pulp, maize gluten, yeast, minerals, fish oil, fructo-oligosaccharides, soybean oil. *L.I.P.: proteins selected for their very high assimilation. Analytical constituents: crude protein 37.0% crude fat 12.0% crude fiber 6.1% crude ash 8.1% calcium 1.11% phosphorus 1.0% magnesium 0.08% arachidonic acid 0.06% biotin 1.8 mg chloride 0.81% choline 2.1 mg iron 221.0 mg moisture 5.5% folic acid 28.1 mg iodine 2.7 mg potassium 0.7% copper 15.0 mg L-carnitine 100.0 mg linoleic acid 2.79% lysine 1.28 g manganese 62.0 mg cystine 0.57 g methionine 0.96 g sodium 0.7% niacin 194.5 mg omega 3 fatty acids 0.49% omega 6 fatty acids 2.95% pantothenic acid 57.1 mg vegetable fiber 14.6 % selenium 0.31 mg starch 22.8 % taurine 2.4 % zinc 200.0 mg vitamin A 22.0 IU vitamin B1 (thiamine) 17.1 mg vitamin B12 (cobalamin) 0.18 mg vitamin B2 (riboflavin) 61.4 mg vitamin B6 (pyridoxine) 28.1 mg vitamin C (ascorbic acid) 200.0 mg vitamin D3 1.0 mg vitamin E (tocopherol) 500.0 mg metabolizable energy 3.64 kcal dietary fiber 14.6 % EPA and DHA fatty acids 0.23 mg lutein 5.0 mg arginine 1.9 % methionine / cystine 1.53 % nitrogen-free extract 31.3 mg