Preview of MEDICA medical trade fair in Duesseldorf, Germany - 11 Nov 2018

A woman demonstrates a wearable performance and metabolic analyzer by Dynostics which works using breath gas monitoring, at the MEDICA fair in Duesseldorf, Germany, 11 November 2018. The system enables athletes to reach their personal training and nutrition goals, based on the values measured. An app forms an important component of this, alongside the analytic hardware, tells the user how many calories their body is currently burning and what proportion of these are carbohydrate, fat and protein. The world's leading medical trade fair MEDICA with more than 5,200 exhibitors runs from 12 until 15 November 2018.

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SASCHA STEINBACH/EPA-EFE/Shutterstock