Adherence
Seven-day diet diaries demonstrate higher repeatability and stronger correlation with biological biomarkers (urine nitrogen/potassium, plasma vitamin C) than food-frequency questionnaires or 24-hour recalls.
For accurate health tracking, use a 7-day food diary where you record everything you eat, including cooking fats and brand names. This method is significantly more accurate than trying to guess your average habits (FFQ) or recalling just one day. The extra effort yields data that better reflects your true biological nutrient intake.
The 7-day diary was generally more repeatable than the other methods... Correlations were generally substantially lower (0.2 to 0.5) between methods than correlations within methods...
Why this rating
Supported by correlation coefficients against biomarkers and repeat administrations in a subset of the cohort.
Source
Nutritional methods in the European Prospective Investigation of Cancer in Norfolk
Sheila Bingham et al. · Public Health Nutrition · 2001
DOI 10.1079/phn2000102
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