Abstract
The absorption of vitamin B12 is a complex process involving gastric acid and intrinsic factor as the indispensable components. In this study, we have investigated the effects of the administration site in enteral feeding on vitamin B12 status in subjects with severe motor and intellectual disabilities (SMID). This is a cross-sectional study conducted from January to June 2016. Blood concentrations of vitamin B12, folate, vitamin B6, and homocysteine (Hcy) were measured in a total of 82 subjects (38 men, 44 women). Also, nutrients intake was assessed. Subjects with enteral feeding (EF) had significantly higher intakes of vitamin B12, folate, and vitamin B6 than those with oral ingestion (OI). Serum folate and vitamin B6 concentrations in subjects with EF were significantly higher than those with OI. Among the EF subjects, serum vitamin B12 concentration was significantly higher in those fed with gastric tube than those fed with jejunal tube in spite of similar vitamin B12 intakes. No significant difference was observed between the two groups regarding the circulating concentrations of folate, vitamin B6, or Hcy. Although each administration route has its own benefit, gastric tube is advantageous in the absorption of vitamin B12.
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