Mixed
A 152-item semiquantitative food frequency questionnaire (SFFQ) provides reasonably valid estimates for ranking individuals' long-term intake of energy and 44 nutrients when compared against multiple 7-day dietary records or automated 24-hour recalls, provided that within-person variation in the comparison methods is statistically accounted for.
For researchers and health professionals, this paper validates the use of the 152-item SFFQ for assessing long-term dietary patterns in large cohorts. It confirms that while SFFQs may underestimate sodium and overestimate some nutrients, they are statistically robust for ranking nutrient intake when compared against detailed records, provided statistical adjustments for day-to-day variation are applied.
These data indicate that this SFFQ provided reasonably valid estimates for intakes of a wide variety of dietary variables and that use of multiple 24-hour recalls or 7DDRs as a comparison method provided similar conclusions if day-to-day variation was taken into account.
Why this rating
Large sample size (n=632), rigorous methodology (multiple recalls/records), and robust statistical deattenuation.
Source
Validity of a Dietary Questionnaire Assessed by Comparison With Multiple Weighed Dietary Records or 24-Hour Recalls
Changzheng Yuan et al. · American Journal of Epidemiology · 2017
DOI 10.1093/aje/kww104
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 →