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Validation Information: myfood24

Albar 2016

Agreement between an online dietary assessment tool (myfood24) and an interviewer-administered 24-h dietary recall in British adolescents aged 11–18 years

myfood24 Is an online 24-h dietary assessment tool developed for use among British adolescents and adults. Limited information is available regarding the validity of using new technology in assessing nutritional intake among adolescents. Thus, a relative validation of myfood24 against a face-to-face interviewer-administered 24-h multiple-pass recall (MPR) was conducted among seventy-five British adolescents aged 11-18 years. Participants were asked to complete myfood24 and an interviewer-administered MPR on the same day for 2 non-consecutive days at school. Total energy intake (EI) and nutrients recorded by the two methods were compared using intraclass correlation coefficients (ICC), Bland-Altman plots (using between and within-individual information) and weighted κ to assess the agreement. Energy, macronutrients and other reported nutrients from myfood24 demonstrated strong agreement with the interview MPR data, and ICC ranged from 0·46 for Na to 0·88 for EI. There was no significant bias between the two methods for EI, macronutrients and most reported nutrients. The mean difference between myfood24 and the interviewer-administered MPR for EI was -230 kJ (-55 kcal) (95 % CI -490, 30 kJ (-117, 7 kcal); P=0·4) with limits of agreement ranging between 39 % (3336 kJ (-797 kcal)) lower and 34 % (2874 kJ (687 kcal)) higher than the interviewer-administered MPR. There was good agreement in terms of classifying adolescents into tertiles of EI (κ w =0·64). The agreement between day 1 and day 2 was as good for myfood24 as for the interviewer-administered MPR, reflecting the reliability of myfood24. myfood24 Has the potential to collect dietary data of comparable quality with that of an interviewer-administered MPR.

Web Link

Validation Information

Year of Publication

Tool Information

Dietary Exposure Measured
Energy, Macronutrient, Micronutrient, Food Groups
Tool Type
24 Hour Recall
Timeframe Tool Measures info
1 Day
Portion Size Measures info
Portion images, standard pack sizes and a section where particpants can enter their own amount.
Reporting Method info
Retrospective; Prospective
Format info
Supplements Measured
Not Reported
Administration Method info
Self-administered or Interviewer-administered

Study Information

Study Location
Leeds, England
Associated Nutrient Database
myfood24 food and nutrient dataset.
Comparator Validated Against
24hr Recall


Sample Size
Age of Population

Range: 11-18 years

Mean: 14.6 years

Other Notable Characteristics

Total number of nutrients validated: 8 info

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:

  • Energy
  • Fat
  • Saturated Fat
  • Mono-unsaturated Fat
  • Poly-unsaturated Fat
  • Carbohydrates
  • Protein
  • Sugar
  • Non‐starch polysaccharides(NSP)
  • Sodium
  • Calcium
  • Iron
  • Zinc
  • Retinol
  • Folate
  • Folic Acid
  • Vitamin B12
  • Vitamin C
  • Fruit & Vegetables
  • Urinary Nitrogen

To find information on the other validated nutrients please read the validation study.

  • Energy
  • Macronutrients: 6
  • Micronutrients: 1
Comparator Lifestage Sex Nutrient Measured info Mean Difference Standard Deviation info Correlation Coefficient info Cohen's Kappa Coefficient Percentage Agreement Percentage Agreement Categories info Lower Limits of Agreement Upper Limits of Agreement
24hr Recall Adolescents Both Energy (kcal) -55 371 0.88 (ICC) 0.62 (w) 83^ 5 -797 687
Energy (kJ) -230 1584 0.88 (ICC) -3336 2874
Protein (g) -2 22 0.77 (ICC) 0.55 (w) 80^ 5 -45 41
Fat (g) -3 25 0.75 (ICC) 0.58 (w) 81^ 5 -52 46
Saturated Fat (g) -2 13 0.70 (ICC) -28 23
Carbohydrates (g) -11 71 0.81 (ICC) 0.71 (w) 87^ 5 -152 130
Total Sugars (g) -14 53 0.75 (ICC) -121 92
Fibre (NSP) (g) -1 5 0.76 (ICC) -10 8
Sodium (mg) -20 1460 0.46 (ICC) -2900 2900
Fruit (g) 1 163 0.67 (ICC) -324 326
Vegetables (g) 4 73 0.47 (ICC) -141 149

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.

Albar SA, Alwan NA, Evans CEL, Greenwood DC, Cade JE. Agreement between an online dietary assessment tool (myfood24) and an interviewer-administered 24-h dietary recall in British adolescents aged 11–18 years. British Journal of Nutrition 2016; 115: 1678-86.