title: Comparison of micronutrient intake measured by a dietary questionnaire and biochemical indicators of micronutrient status.
abstract: We compared the intake of 12 micronutrients as reported on a semiquantitative food frequency questionnaire with corresponding biochemical indicators of nutrient status in a sample of 57 males and 82 females aged 40-83 y. Age-, sex-and energy-adjusted correlation coefficients ranged from near zero for thiamin, vitamin A, and zinc to 0.63 for folate. Correlation coefficients between intake and the biochemical measures were > 0.30 for carotenoids, vitamin D, vitamin E, vitamin B-12, folate, and vitamin C. Differences of 50% or more were observed between extreme quartiles of intake for mean plasma concentrations of folate, vitamin B-12, and vitamin C. Excluding nutrient supplement users generally reduced the correlations. These data demonstrate that food frequency questionnaires can provide valid information on intake for a number of micronutrients.
authors.affiliation: USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111.
authors.forename: P F
authors.initials: PF
authors.lastname: Jacques
authors.forename: S I
authors.initials: SI
authors.lastname: Sulsky
authors.forename: J A
authors.initials: JA
authors.lastname: Sadowski
authors.forename: J C
authors.initials: JC
authors.lastname: Phillips
authors.forename: D
authors.initials: D
authors.lastname: Rush
authors.forename: W C
authors.initials: WC
authors.lastname: Willett
mesh_terms: D000328:Adult; D000368:Aged; D015930:Diet Records; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009747:Nutritional Physiological Phenomena; D012737:Sex Factors; D011795:Surveys and Questionnaires; D014131:Trace Elements / Q000008:administration & dosage* / Q000097:blood; D014815:Vitamins / Q000008:administration & dosage* / Q000097:blood
chemical_list: D014131:Trace Elements; D014815:Vitamins