Identifying Wearable Biomarkers to Monitor Dietary Intake

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1 Participants 10 healthy male and female participants. This is a pilot study in a new area and therefore a formal power calculation is not possible. 2\. Recruitment Participants will be recruited from existing healthy volunteer databases and by advertisement in public places. Adverts may be placed in newspapers and put up in public buildings. A contact number on the advert will enable potential participants to contact the research team at Imperial College London. Participation in the study will be entirely voluntary. No undue influence will be exerted by the researchers. Participants will be free to withdraw from the study at any time. 3 Pre-Screening Questionnaire A pre-screening questionnaire considering the inclusion and exclusion criteria will be completed to establish eligibility. For subjects who complete the questionnaire but do not continue to participate, their data will not be saved. 4 Informed Consent All participants will sign informed consent before starting the study (at the beginning of the 1st main study visit). 5 Main Study Visits Ten healthy subjects will attend two study visits at National Institute for Health and Care Research (NIHR) Imperial College London Clinical Research Facility (post code: W12 0NN, London, UK). The participants will consume a high- and low-calorie meal designed by nutritional researchers, in a randomised order. Randomization will be performed using the sealed envelope website by an independent researcher (i.e., not linked to the study). During eating events, physiological changes such as skin temperature, blood oxygen saturation, pulse rate etc and eating movements will be measured via a bedside monitor and non-invasive, wearable sensors. Blood samples will be taken at pre-determined time-points, starting 5 minutes before the meal and lasting for 60 minutes postprandially (at -5, +15, +30, +45, +60 min ). A total of 25 ml blood will be taken per visit.