Human sweat contains chemical information including blood metabolites, ion concentrations, and nutrients. Monitoring this information using a wearable sensor can allow non-invasive (i.e., without blood sampling), real time health status tracking. For example, knowing sweat volume and ion concentrations can help people maintain adequate water and sodium levels during physical activities, and can prevent hypoglycemic shock by identifying symptomatic excessive sweating.
https://www.lifetechnology.com/blogs/life-technology-medical-news/development-of-a-low-power-long-term-sweat-sensor-patch-that-imitates-sensory-neurons
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