Every100g of white rice contains15.5g of water, 6.2g of protein, 0.8g of fat, 76.6g of carbohydrate, 0.3g of cellulose, 0.6g of ash, 6mg of calcium, 3mg of sodium,150mg of phosphorus, 0.4mg of iron and vitamins. B1:0.09 mg, B2: 0.03 mg and nicotinic acid 1.4mg provide 35 1 calorie. Rice is the source of human starch, and it is also important for protein? Source. Protein of rice is stored in the endosperm tissue in the form of granules, especially in the aleurone layer, the outermost layer of endosperm.