Serum Vitamin B12 Concentration in Dietary Deficiency

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Abstract
Serum vitamin B12 concentrations in twenty-three villagers of Iran consuming a diet extremely low in animal protein and presumably in vitamin B12 content did not differ significantly from that found in twenty-three villagers who ate animal protein and who presumably received adequate amounts of the vitamin. Possible explanations are offered for this finding. The serum vitamin B12 concentrations were not significantly different from those found in normal persons in the United States. This study indicates that vitamin B12 deficiency caused only by a deficient diet must be very rare.