Criteria for establishing whether or not a dietary constituent is an essential nutrient were implicit in the types of investigations that had provided the basis for the concept of nutritional essentiality. Later they were elaborated in more detail as follows:
By 1950 some 35 nutrients had been shown to meet these criteria. Nutrients presently accepted as essential for humans and for which there are recommended dietary intakes (RDIs) or allowances (RDAs) are listed in T§b!e,„1J,„.
Table 1.1 Nutrients Essential for Humans
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