Tool Library Tool Information
Validation Information: myfood24
Validity of an online 24-h recall tool (myfood24) for dietary assessment in population studies: comparison with biomarkers and standard interviews
Background: Online dietary assessment tools can reduce administrative costs and facilitate repeated dietary assessment during follow-up in large-scale studies. However, information on bias due to measurement error of such tools is limited. We developed an online 24-h recall (myfood24) and compared its performance with a traditional interviewer-administered multiple-pass 24-h recall, assessing both against biomarkers.
Methods: Metabolically stable adults were recruited and completed the new online dietary recall, an interviewer-based multiple pass recall and a suite of reference measures. Longer-term dietary intake was estimated from up to 3 x 24-h recalls taken 2 weeks apart. Estimated intakes of protein, potassium and sodium were compared with urinary biomarker concentrations. Estimated total sugar intake was compared with a predictive biomarker and estimated energy intake compared with energy expenditure measured by accelerometry and calorimetry. Nutrient intakes were also compared to those derived from an interviewer-administered multiple-pass 24-h recall.
Results: Biomarker samples were received from 212 participants on at least one occasion. Both self-reported dietary assessment tools led to attenuation compared to biomarkers. The online tools resulted in attenuation factors of around 0.2-0.3 and partial correlation coefficients, reflecting ranking intakes, of approximately 0.3-0.4. This was broadly similar to the more administratively burdensome interviewer-based tool. Other nutrient estimates derived from myfood24 were around 10-20% lower than those from the interviewer-based tool, with wide limits of agreement. Intraclass correlation coefficients were approximately 0.4-0.5, indicating consistent moderate agreement.
Conclusions: Our findings show that, whilst results from both measures of self-reported diet are attenuated compared to biomarker measures, the myfood24 online 24-h recall is comparable to the more time-consuming and costly interviewer-based 24-h recall across a range of measures.
Total number of nutrients validated: 7
Not all of the nutrients validated in the validation studies are included in the table below, as statistical data was only selected to be displayed for a number of nutrients, this included:
- Saturated Fat
- Mono-unsaturated Fat
- Poly-unsaturated Fat
- Non‐starch polysaccharides(NSP)
- Folic Acid
- Vitamin B12
- Vitamin C
- Fruit & Vegetables
- Urinary Nitrogen
To find information on the other validated nutrients please read the validation study.
- Macronutrients: 9
- Micronutrients: 8
|Comparator||Lifestage||Sex||Nutrient Measured||Mean Difference||Standard Deviation||Correlation Coefficient||Cohen's Kappa Coefficient||Percentage Agreement||Percentage Agreement Categories||Lower Limits of Agreement||Upper Limits of Agreement|
|24hr Recall||Adults||Both||Energy (kcal)||-10 (Ratio of Geo)||0.51 (ICC)||-63 (Ratio of Geo)||118 (Ratio of Geo)|
|Energy (kJ)||-10 (Ratio of Geo)||0.51 (ICC)||-63 (Ratio of Geo)||118 (Ratio of Geo)|
|Protein (g)||-9 (Ratio of Geo)||0.45 (ICC)||-68 (Ratio of Geo)||158 (Ratio of Geo)|
|Fat (g)||-14 (Ratio of Geo)||0.42 (ICC)||-74 (Ratio of Geo)||182 (Ratio of Geo)|
|Saturated Fat (g)||-13 (Ratio of Geo)||0.40 (ICC)||-79 (Ratio of Geo)||263 (Ratio of Geo)|
|MUFA (g)||-14 (Ratio of Geo)||0.40 (ICC)||-78 (Ratio of Geo)||238 (Ratio of Geo)|
|PUFA(g)||-11 (Ratio of Geo)||0.39 (ICC)||-80 (Ratio of Geo)||303 (Ratio of Geo)|
|Carbohydrates (g)||-12 (Ratio of Geo)||0.54 (ICC)||-70 (Ratio of Geo)||162 (Ratio of Geo)|
|Sugars (g)||-20 (Ratio of Geo)||0.46 (ICC)||-80 (Ratio of Geo)||216 (Ratio of Geo)|
|Fiber (g)||-14 (Ratio of Geo)||0.43 (ICC)||-75 (Ratio of Geo)||199 (Ratio of Geo)|
|Sodium (mg)||-4 (Ratio of Geo)||0.44 (ICC)||-76 (Ratio of Geo)||283 (Ratio of Geo)|
|Calcium (mg)||-7 (Ratio of Geo)||0.46 (ICC)||-79 (Ratio of Geo)||223 (Ratio of Geo)|
|Iron (mg)||-10 (Ratio of Geo)||0.46 (ICC)||-70 (Ratio of Geo)||170 (Ratio of Geo)|
|Zinc (mg)||-10 (Ratio of Geo)||0.46 (ICC)||-72 (Ratio of Geo)||197 (Ratio of Geo)|
|Retinol (µg)||-27 (Ratio of Geo)||0.37 (ICC)||-98 (Ratio of Geo)||2188 (Ratio of Geo)|
|Folate (µg)||-14 (Ratio of Geo)||0.45 (ICC)||-78 (Ratio of Geo)||215 (Ratio of Geo)|
|Vitamin B12 (µg)||-27 (Ratio of Geo)||0.40 (ICC)||-90 (Ratio of Geo)||422 (Ratio of Geo)|
|Vitamin C (mg)||-28 (Ratio of Geo)||0.45 (ICC)||-94 (Ratio of Geo)||765 (Ratio of Geo)|
Some results have been calculated using statistical techniques based on the published data.
For further information on statistical terms click on Statistical tests used in validation studies
All correlations coefficients in the table are unadjusted unless stated otherwise. For adjusted correlation coefficients and other statistical methods used in the study e.g. paired t-tests, please read the validation articles.
- # Adjusted
- † Energy adjusted.
- ‡ For loge-transformed, energy-adjusted nutrient intakes.
- ^ Adjacent included.
- ᵟ Participants provided identical responses.
- (w) = Weighted.
Wark PA, Hardie LJ, Frost GS, Alwan NA, Carter M, Elliott P, et al. Validity of an online 24-h recall tool (myfood24) for dietary assessment in population studies: comparison with biomarkers and standard interviews. BMC Med. 2018;16(1):136.