This is the method of measuring protein quality. Protein is used in the cells of the human and animal organisms. The more protein is retained in the organism the higher is the level of utilization of the particular protein provided through food/feed and the higher is its biological value. The biological value is the ratio of protein consumed to the amount of protein retained in the organism and not excreted as urine or fæcal matter. Isolated whey and egg protein are amongst the products with the highest biological value and serve as measurement (biological value of isolated whey = 100). Biological value of other foods: whole eggs 94, cow milk 91, fish 83, casein 80, beef 80, chicken 79, soy 74, wheat gluten 54, kidney beans 49.

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