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Vol. 53, No. 2, 2008
Issue release date: November 2008
Ann Nutr Metab 2008;53:143–150
(DOI:10.1159/000170890)

Folate, Vitamin B12 and Homocysteine Status in Women of Childbearing Age: Baseline Data of Folic Acid Wheat Flour Fortification in Iran

Abdollahi Z. · Elmadfa I. · Djazayeri A. · Sadeghian S. · Freisling H. · Salehi Mazandarani F. · Mohamed K.
aFamily Health Department, Ministry of Health and Medical Education, bDepartment of Nutrition and Biochemistry, School of Public Health, Tehran University of Medical Science, and cDepartment of Epidemiology and Biostatistics, Tehran University of Medical Science, Tehran, Iran; dDepartment of Nutritional Sciences, University of Vienna, Vienna, Austria

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Abstract

Background: Folic acid fortification implemented mandatorily in many countries has been associated with significant increase in blood folate concentrations and reduction in the prevalence of neural tube defects. However, there are controversial findings on the probability of vitamin B12 deficiency being masked in the population after folic acid fortification. Baseline data on folate and vitamin B12 status are necessary before mandatory flour fortification is implemented. Objectives: To assess dietary intake of folate and vitamin B12 and to determine blood concentrations of folate, vitamin B12 and homocysteine in women of childbearing age as baseline data regarding folic acid fortification in Iran. Methods: A descriptive cross-sectional survey was performed with 579 healthy women as a representative sample of the Golestan province. Fasting blood samples were taken and dietary (24-hour recall), health and sociodemographic data were collected with an interview. Serum concentrations of folate and vitamin B12 were measured with radioimmunoassay, and plasma homocysteine concentrations were assessed by high-performance liquid chromatography with fluorescence detection. Results: Mean serum concentrations of folate and vitamin B12 were 13.6 nmol/l (95% CI 12.8–14.4) and 194.4 pmol/l (95% CI 183.8–205.0), respectively. Inadequate serum folate levels were present in 14.3% of the women and 22.7% had serum vitamin B12 levels below normal. Mean plasma homocysteine concentration was 12.6 µmol/l (95% CI 12.1–13.2) and hyperhomocysteinemia was observed in 38.3% of the women. Mean daily intake of folate and vitamin B12 was 198.3 µg (95% CI 185.4–211.3) and 2.6 µg (95% CI 1.9–3.2), respectively. Folate intake from food was positively correlated with serum folate concentrations (r = 0.084, p < 0.05) and inversely correlated with plasma homocysteine concentrations (r = –0.115, p < 0.01). Conclusions: An insufficient vitamin B12 as well as folate status is present in Iranian women of childbearing age. The final evaluation will be carried out 18 months after flour fortification and the results will be compared with baseline data obtained from the present study in order to show the efficacy and safety of folic acid fortification in Iran.



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