Nutrition surveys suggest that less than 10% of Canadian adults have inadequate riboflavin intakes. However, biochemical riboflavin deficiency (erythrocyte glutathione reductase activity coefficient, EGRac ≥ 1.40) has been reported in 41% of young adult women living in Metro Vancouver. Canadian Chinese ethnicity comprise > 25% of Vancouver's population and are postulated to have poorer riboflavin status than those of European ethnicity, as they may be less likely to consume dairy products and fortified wheat.The objectives of this study were to determine dietary riboflavin intake and food sources, and to assess the association between riboflavin intake and status among young women of European (n = 107) and Chinese (n = 91) ethnicities living in Metro Vancouver, Canada.This was a cross-sectional study conducted on women (19 - 45 years). Women were healthy, not pregnant or breastfeeding, of European or Chinese ethnicities, and not taking riboflavin-containing supplements for the past 4 months. Dietary riboflavin intake was assessed using the past-year Diet History Questionnaire II and riboflavin status (EGRac) was measured in fasting venous blood samples.Only 7% of participants had dietary riboflavin intakes below the EAR (0.9 mg/d), but 40% of women had biochemical riboflavin deficiency (EGRac ≥ 1.40). Although more Canadian women of European ethnicity than Chinese ethnicity had biochemical riboflavin deficiency (46% and 34%; P < 0.001), median dietary riboflavin intake did not differ (1.73 and 1.82 mg/d; P = 0.587). Dairy products and vegetables contributed the most to riboflavin intake. Energy-adjusted dietary riboflavin intake was inversely associated with EGRac (B = -0.04, 95% CI: -0.07, -0.01). However, after further adjustment the relationship was not significant.Overall, women of reproductive age living in Metro Vancouver, Canada, had a low prevalence of inadequate dietary riboflavin intake despite the high prevalence of apparent biochemical riboflavin deficiency.
|Journal||Curr Dev Nutr|
|Publication status||E-pub ahead of print - 2021|