Sanaz Jamshidi - Department of Nutrition, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
Afane Ahmadi - Research Center for Health Sciences, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran.
Nasrin Nasimi - Department of Community Nutrition, Nutrition Research Center, Shiraz University of Medical Science, Shiraz, Iran.
Nadia Razmjoui - Department of Clinical Nutrition, , School of Nutrition and food sciences, Shiraz University of Medical Sciences, Shiraz, Iran.
Shabnam Bagheri - Department of Clinical Nutrition, , School of Nutrition and food sciences, Shiraz University of Medical Sciences, Shiraz, Iran.
Zahra Esmaeilinezhad - Nutrition Research Center, Shiraz University of Medical Science, Shiraz, Iran.

Background: Vitamin B12 plays an important role in many metabolic pathways, obesity, and insulin resistance and the elderly as a high-risk group are prone to its deficiency. In this regard, this study investigated the relationship between serum vitamin B12 and glycemic indices, dietary components and body mass index (BMI) in elderly population.Methods: In a cross-sectional study, ninety elderly aged 65 years and older from an senior center were enrolled. After completing the demographic questionnaire and assessing BMI, 5 mL blood sample was provided to measure serum vitamin B12, insulin and blood glucose levels. On the other hand, the vitamin B12 content of the diet was extracted from thefood frequency questionnaire (FFQ).Results: About 58% of the elderly had serum vitamin B12 levels below normal. There was a significant correlation between low vitamin B12 levels, body weight and BMI. Furthermore, the relationship between low serum vitamin B12 level and fasting blood glucose level was also significant (p <0.05). FFQ results indicated a significant relationship between serum vitamin B12 level and the amount of different types ofmeat and eggs.Conclusion: The favorable level of vitamin B12 was shown to play a role in hyperglycemia control and to reach a normal weight.

Elderly, Vitamin B12, Glycemic Indices, Body mass index