Research
Mixed
Self-administered Food Frequency Questionnaires (FFQs) used in large cohorts provide valid estimates of macronutrient and food group intake, though they may underestimate micronutrient intake compared to 24-hour recalls.
Diet surveys are generally good at tracking big nutrient groups like fat and protein, but might miss precise amounts of certain vitamins and minerals.
GoodQualifiesHIGH confidence
For total energy and most nutrients, intakes assessed by the Nutrition Cohort FFQ were lower than those from the 24-hour dietary recalls... Median values for these micronutrients were influenced particularly by low correlation coefficients for zinc... and vitamin E...
Why this rating
Based on validation study against 24-hour recalls.
Source
The American Cancer Society Cancer Prevention Study II Nutrition Cohort
Eugenia E. Calle et al. · Cancer · 2002
DOI 10.1002/cncr.10197
cohort · n=184194Cited 481×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
Related findings · Mixed
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