Intake of vitamin B12 and other characteristics of women of reproductive age on a vegan diet in Australia
Abstract Objective: (i) to examine demographic and health characteristics of women of reproductive age on a vegan diet in Australia and compare these to the general population, (ii) to identify sources and intake of vitamin B12, and compare intake to current recommendations (iii) examine associations between participant characteristics and adequacy of vitamin B12 intake. Design: In this cross-sectional study data was collected via an online survey. Demographic and health characteristics of women on a vegan diet were compared to women in the general population (using Australian Bureau of Statistics data). Intake of vitamin B12 was estimated using a food frequency questionnaire and estimation of supplemental intake. Setting: Australia. Participants: Participants (n1530) were women 18-44 years who had been on a vegan diet for at least six months. Results: While Body Mass Index, smoking habits and intakes of fruit and vegetables compared favourably to the general population, 26% of respondents had estimated intakes of vitamin B12 below recommendations. Analyses of relationships between vitamin B12 intake and participant characteristics revealed that the strongest predictor of intake was supplementation (p<0.001), however, 25% had not supplemented with vitamin B12 in the past three months. Conclusions: The vitamin B12 intakes of a substantial proportion of Australian women of reproductive age consuming a vegan diet do not meet the recommended intake, which could adversely affect their health, and, if they are pregnant or lactating, that of their infants too. There is a need for further research in this area to identify effective strategies to address this situation.