Abstract
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.
Highlights
Assessing nutritional status in large prospective epidemiological studies with the available traditional dietary assessment methods is challenging
This study aimed to assess the agreement between myfood24 and an interviewer-administered 24-h multiple-pass dietary recall (interview (MPR)) for use among British adolescents aged 11–18 years
This study demonstrates that myfood24 is an appropriate, reliable and easy-to-use[20,34] tool among British adolescents aged 11–18 years. myfood24 Has the potential to collect dietary data of comparable quality to that of an interview (MPR), which is considered to be the gold standard in the USA and is the most widely used method
Summary
Assessing nutritional status in large prospective epidemiological studies with the available traditional dietary assessment methods is challenging Such studies require a large number of participants and repeated measures over a period of time to account for changes in diet and to adequately reflect usual long-term diet[1]. Measure Your Food On One Day (myfood24) has been developed[20] It is a UK online 24 h dietary assessment tool designed to address the need for a valid, reliable, lowburden and user-friendly dietary assessment method suitable for use among different age groups (adolescents and adults), with the aim of standardising the method used for the whole population. This study aimed to assess the agreement between myfood and an interviewer-administered 24-h multiple-pass dietary recall (interview (MPR)) for use among British adolescents aged 11–18 years
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