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Nutrition

Question
57 out of 74
 

The protein efficiency ratio (PER) is defined as:



A The gain in weight of young animals per unit weight of protein-consumed

B The product of digestibility coefficient and biological value

C The percentage of protein absorbed into the blood

D The percentage of nitrogen absorbed from the protein absorbed from the diet

Ans. A The gain in weight of young animals per unit weight of protein-consumed Protein efficiency ratio (PER) is sometimes used to rate proteins and represents the amount of weight gained (in grams) relative to the amount of protein consumed (in grams). For example, a PER of 2.5 would mean that 2.5 grams of weight was gained for every gram of protein ingested.

a. Since it is impossible to measure weight gain in grams in humans, PER is generally measured in young, growing animals placed on a diet which is 10% protein by weight. This begs the question of whether young animals, who are growing, provide a good model for adult humans.

b. While the Food and Drug Administration has suggested the use of PER with casein as a reference model for labeling protein foods, the use of PER to estimate human protein requirements has been criticized by some author.

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