Mixed
A 7-day dietary record (7DDR) provides higher relative validity for estimating nutrient intake compared to a single semiquantitative food frequency questionnaire (SFFQ) or averaged 24-hour recalls (ASA24) when validated against urinary and plasma biomarkers.
If you need to know your exact nutrient intake (especially sodium, potassium, or protein) for health reasons, a 7-day food diary is more accurate than a standard food frequency questionnaire or a single day's recall. While FFQs are convenient, they underestimate validity compared to biomarkers. Use a diary if precision matters; use an FFQ only for broad ranking.
In general, relative to biomarkers, averaged ASA24s had lower validity than the SFFQ completed at the end of the data-collection year (SFFQ2); SFFQ2 had slightly lower validity than 1 7DDR; the averaged SFFQs had validity similar to that of 1 7DDR; and the averaged 7DDRs had the highest validity.
Why this rating
Large sample size (n=627), use of objective biomarkers (urinary/plasma), and rigorous statistical deattenuation.
Source
Relative Validity of Nutrient Intakes Assessed by Questionnaire, 24-Hour Recalls, and Diet Records as Compared With Urinary Recovery and Plasma Concentration Biomarkers: Findings for Women
Changzheng Yuan et al. · American Journal of Epidemiology · 2017
DOI 10.1093/aje/kwx328
More from this paper
- Food Frequency Questionnaires (FFQs) and 24-hour recalls significantly underreport total energy intake and sodium intake compared to objective biomarkers (Doubly Labeled Water and urinary sodium).Strong
- Averaged 24-hour recalls (ASA24) provide validity for energy-adjusted protein, sodium, and potassium intakes that is comparable to a single SFFQ, but lower than averaged 7-day dietary records.Strong
Related findings · Mixed
- Bariatric surgery (VSG and RYGB) is the most effective and sustainable treatment for obesity, producing marked and sustained weight loss that non-surgical interventions cannot match.Strong
- Severely protein-deficient diets (2–3% energy) induce lean body mass loss and metabolic imbalance, whereas adequate protein intake (0.66 g/kg/d minimum) is a prerequisite for maintaining muscle, bone, and physiological function.Strong
- For patients with Class III obesity (BMI >39.9 kg/m2), metabolic bariatric surgery (MBS) is significantly more effective than any currently approved medication, with BilioPancreatic Diversion (BPD) showing the highest estimated weight loss.Strong
This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →