Comparison of micronutrient intake measured by a dietary questionnaire and biochemical indicators of micronutrient status.
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.
Jacques
P F
PF
USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111.
Sulsky
S I
SI
Sadowski
J A
JA
Phillips
J C
JC
Rush
D
D
Willett
W C
WC
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
D014131:Trace Elements; D014815:Vitamins