Comparison of micronutrient intake measured by a dietary questionnaire and biochemical indicators of micronutrient status.

摘要: We compared the intake of 12 micronutrients as reported on a semiquantitative food frequency questionnaire with corresponding biochemical indicators nutrient status in sample 57 males and 82 females aged 40-83 y. Age-, sex-and energy-adjusted correlation coefficients ranged from near zero for thiamin, vitamin A, zinc to 0.63 folate. Correlation between measures were > 0.30 carotenoids, D, E, B-12, folate, C. Differences 50% or more observed extreme quartiles mean plasma concentrations Excluding supplement users generally reduced correlations. These data demonstrate that questionnaires can provide valid information number micronutrients.