 In particular, whilst on a high protein diet the BV of all foods consumed is reduced — the limiting rate at which the amino acids may be incorporated into the body is not the availability of amino acids but the rate of protein synthesis possible in cells.This is a major point of criticism of BV as a test; the test diet is artificially protein rich and may have unusual effects.BV is designed to ignore variation in digestibility of a food — which in turn largely depends on the food preparation.