Correlations of GDP per capita per year with total protein supplies per capita per day and animal-protein ratios were computed by pooling data prom 164 countries. Average supplies for 1972–1974, 1975–1977, 1979–1981, and 1984–1986 were determined from FAO food balances sheets. Essential amino acid (EAA) supplies by country were computed using amino acid data for food commodities shown in FAO food balance sheets and other data. The EAA requirements for the four periods were estimated by country. When the latest amino acid requirement estimates are used, lysine is the limiting amino acid in all predominantly cereal diets.
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