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Cyanocobalamin (vitamin B-12) status in Seventh-day Adventist ministers in Australia^1,2

¹ From the Pathology Department, Sydney Adventist Hospital and Adventist Health Department, Australia.

As part of the Adventist Ministers' Health Study, a series of cross-sectional surveys conducted in 1992, 1994, and 1997, the serum vitamin B-12 status of 340 Australian Seventh-day Adventist ministers was assessed in 1997. The ministers in the study participated voluntarily. Of this group, 245 were either lactoovovegetarians or vegans who were not taking vitamin B-12 supplements. Their mean vitamin B-12 concentration was 199 pmol/L (range: 58–538 pmol/L), 53% of whom had values below the reference range for the method used (171–850 pmol/L) and 73% of whom had values <221 pmol/L, the lower limit recommended by Herbert. Dual-isotope Schillings test results in 36 lactoovovegetarians with abnormally low vitamin B-12 concentrations indicated that dietary deficiency was the cause in 70% of cases. Data from the dietary questionnaires supported dietary deficiency as the cause of low serum vitamin B-12 in this population of lactoovovegetarians and vegans, 56 (23%) of whom consumed sufficient servings of vitamin B-12–containing foods to obtain the minimum daily maintenance allowance of the vitamin (1 µg).

Key Words: Vitamin B-12 • cyanocobalamin • lactoovovegetarian • vegan • Schillings test • recommended daily allowance • RDA • Seventh-Day Adventists • ministers

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