title: A pilot study to determine whether using a lightweight, wearable micro-camera improves dietary assessment accuracy and offers information on macronutrients and eating rate.
abstract: A major limitation in nutritional science is the lack of understanding of the nutritional intake of free-living people. There is an inverse relationship between accuracy of reporting of energy intake by all current nutritional methodologies and body weight. In this pilot study we aim to explore whether using a novel lightweight, wearable micro-camera improves the accuracy of dietary intake assessment. Doubly labelled water (DLW) was used to estimate energy expenditure and intake over a 14-d period, over which time participants (n 6) completed a food diary and wore a micro-camera on 2 of the days. Comparisons were made between the estimated energy intake from the reported food diary alone and together with the images from the micro-camera recordings. There was an average daily deficit of 3912 kJ using food diaries to estimate energy intake compared with estimated energy expenditure from DLW (P=0·0118), representing an under-reporting rate of 34 %. Analysis of food diaries alone showed a significant deficit in estimated daily energy intake compared with estimated intake from food diary analysis with images from the micro-camera recordings (405 kJ). Use of the micro-camera images in conjunction with food diaries improves the accuracy of dietary assessment and provides valuable information on macronutrient intake and eating rate. There is a need to develop this recording technique to remove user and assessor bias.
authors.affiliation: 1Nutrition and Dietetic Research Group, Faculty of Medicine,Imperial College London,London W12 0NN,UK.
authors.forename: Claire
authors.initials: C
authors.lastname: Pettitt
authors.affiliation: 2The Hamlyn Centre,Institute of Global Health Innovation,Imperial College London,London SW7 2AZ,UK.
authors.forename: Jindong
authors.identifier: http://orcid.org/0000-0003-0594-373X
authors.initials: J
authors.lastname: Liu
authors.affiliation: 2The Hamlyn Centre,Institute of Global Health Innovation,Imperial College London,London SW7 2AZ,UK.
authors.forename: Richard M
authors.identifier: http://orcid.org/0000-0002-0184-8391
authors.initials: RM
authors.lastname: Kwasnicki
authors.affiliation: 2The Hamlyn Centre,Institute of Global Health Innovation,Imperial College London,London SW7 2AZ,UK.
authors.forename: Guang-Zhong
authors.identifier: http://orcid.org/0000-0003-4060-4020
authors.initials: GZ
authors.lastname: Yang
authors.affiliation: 3Stable Isotope Biochemistry Laboratory,Scottish Universities Environmental Research Centre,The University of Glasgow,East Kilbride G75 0QF,UK.
authors.forename: Thomas
authors.initials: T
authors.lastname: Preston
authors.affiliation: 1Nutrition and Dietetic Research Group, Faculty of Medicine,Imperial College London,London W12 0NN,UK.
authors.forename: Gary
authors.identifier: http://orcid.org/0000-0003-0529-6325
authors.initials: G
authors.lastname: Frost
mesh_terms: D000328:Adult; D003903:Deuterium; D004032:Diet; D015930:Diet Records; D004044:Dietary Proteins; D004435:Eating; D002149:Energy Intake; D005247:Feeding Behavior; D005260:Female; D006801:Humans; D008297:Male; D015596:Nutrition Assessment; D010103:Oxygen Isotopes; D010781:Photography; D010865:Pilot Projects; D014867:Water; D055815:Young Adult
chemical_list: D004044:Dietary Proteins; D010103:Oxygen Isotopes; D014867:Water; D003903:Deuterium
keywords: DLW doubly labelled water; Dietary recording; Doubly labelled water; Energy intake; Micro-camera devices; TEE total energy expenditure