OBJECTIVE: We asked whether women self-reporting the recommended consumption of vitamin D from milk and multivitamins would be less likely to have low wintertime 25-hydroxyvitamin D (25(OH)D) levels. METHODS: This cross-sectional study enlisted at least 42 young women each month (age 18-35 y, 796 women total) through one year. We measured serum 25(OH)D and administered a lifestyle and diet questionnaire. RESULTS: Over the whole year, prevalence of low 25(OH)D (<40 nmol/l) was higher in non-white, non-black subjects (25.6% of 82 women) than in the white women (14.8% of 702 white women, P<0.05). Of the 435 women tested during the winter half of the year (November-April), prevalence of low 25(OH)D was not affected by vitamin D intake: low 25(OH)D occurred in 21% of the 146 consuming no vitamin D, in 26% of the 140 reporting some vitamin D intake, up to 5 microg/day (median, 2.5 microg/day), and in 20% of the 149 women reporting vitamin D consumption over 5 microg/day (median, 10 microg/day). INTERPRETATION: The self-reported vitamin D intake from milk and/or multivitamins does not relate to prevention of low vitamin D nutritional status of young women in winter. Recommended vitamin D intakes are too small to prevent insufficiency. Vitamin D nutrition can only be assessed by measuring serum 25(OH)D concentration.
OBJECTIVE: We asked whether women self-reporting the recommended consumption of vitamin D from milk and multivitamins would be less likely to have low wintertime 25-hydroxyvitamin D (25(OH)D) levels. METHODS: This cross-sectional study enlisted at least 42 young women each month (age 18-35 y, 796 women total) through one year. We measured serum 25(OH)D and administered a lifestyle and diet questionnaire. RESULTS: Over the whole year, prevalence of low 25(OH)D (<40 nmol/l) was higher in non-white, non-black subjects (25.6% of 82 women) than in the white women (14.8% of 702 white women, P<0.05). Of the 435 women tested during the winter half of the year (November-April), prevalence of low 25(OH)D was not affected by vitamin D intake: low 25(OH)D occurred in 21% of the 146 consuming no vitamin D, in 26% of the 140 reporting some vitamin D intake, up to 5 microg/day (median, 2.5 microg/day), and in 20% of the 149 women reporting vitamin D consumption over 5 microg/day (median, 10 microg/day). INTERPRETATION: The self-reported vitamin D intake from milk and/or multivitamins does not relate to prevention of low vitamin D nutritional status of young women in winter. Recommended vitamin D intakes are too small to prevent insufficiency. Vitamin D nutrition can only be assessed by measuring serum 25(OH)D concentration.
Authors: David A Hanley; Ann Cranney; Glenville Jones; Susan J Whiting; William D Leslie; David E C Cole; Stephanie A Atkinson; Robert G Josse; Sidney Feldman; Gregory A Kline; Cheryl Rosen Journal: CMAJ Date: 2010-07-12 Impact factor: 8.262
Authors: Kurtis Sarafin; Ramón Durazo-Arvizu; Lu Tian; Karen W Phinney; Susan Tai; Johanna E Camara; Joyce Merkel; Evan Green; Christopher T Sempos; Stephen P J Brooks Journal: Am J Clin Nutr Date: 2015-09-30 Impact factor: 7.045
Authors: Victoria Zigmont; Amy Garrett; Jin Peng; Michal Seweryn; Grzegorz A Rempala; Randall Harris; Christopher Holloman; Thomas E Gundersen; Anders Ahlbom; Maria Feychting; Tom Borge Johannesen; Tom Kristian Grimsrud; Judith Schwartzbaum Journal: Nutr Cancer Date: 2015-08-28 Impact factor: 2.900
Authors: Z Lu; T C Chen; A Zhang; K S Persons; N Kohn; R Berkowitz; S Martinello; M F Holick Journal: J Steroid Biochem Mol Biol Date: 2007-01-30 Impact factor: 4.292