Validation of a new mobile phone dietary assessment tool DietPhone against diet diaries and urinary nitrogen

L. Monaghan, A. Paget, D. Young, K. Aitchison, H. I. M. Davidson, M. E. Clapham
2010 Proceedings of the Nutrition Society  
Dietary assessments methods are vital in assessing nutrient intakes in individuals and groups. New dietary assessment technologies are now becoming available, which may potentially improve the accuracy and efficiency of dietary assessment. However, limited amount of research has been performed to determine if new technologies are valid methods of dietary assessment. DietPhone is an application downloadable onto mobile phone handsets. It has been developed and designed by staff at Queen Margaret
more » ... University to record dietary intake. It contains the complete food database published by the FSA (1) . To determine the relative validity of a new dietary assessment technology, the DietPhone, was compared to Diet Diary and using an independent marker of urinary nitrogen as a biomarker of validity. Thirty adult subjects recorded their dietary intake for five consecutive week days using two forms of dietary assessment methods, the Dietphone and Diet Diary, and ten of these adults also completed a 24-h urine collection. The Bland-Altman (2) methodology was used to compare the difference between the two methods, for several nutrients, to detect bias between methods. The Pearson correlation coefficient was also performed to determine the strength relationship between 24-h urinary nitrogen and protein intake.
doi:10.1017/s0029665110002764 fatcat:2kbv43jidncflp5xcpc3rlwcka