日本人成人女性ビーガンのビタミン B₁₂ 摂取量の評価

抄録

Vegetarian diets provide relatively large amounts of vegetable, cereals, nuts and fruits. Thus those diets have relatively low intakes of protein, saturated fatty acid, retinol and vitamin B₁₂. The plant foods do not contain vitamin B₁₂; in particularly, vegans may have low intakes of vitamin B₁₂. To estimate the daily intake of vitamin B₁₂ in Japanese woman vegans, 33 duplicate portion samples of daily diets were collected from 11 Japanese adult female vegans and their vitamin B₁₂ were determined by microbiological assay using Lactobacillus delbrueckii subsp. lactis ATCC7830. Content of vitamin B₁₂ in Japanese woman vegan diets were as follows: range, 0-2.1μg/day; median; 0.14μg/day. Compared with estimated average requirement and recommended dietary allowance in female aged 30 to 49 years in the Dietary References Intakes for Japanese 2010, vitamin B₁₂ in vegan diets is quite low. This study suggested that Japanese woman vegans should have the laver and permitted to have the vitamin B₁₂ supplement or vitamin B₁₂-fortified vegetable for preventing a vitamin B₁₂ deficiency.