There's a tracker for that—but would you really want to wear it?
Attempting to measure multiple metabolites on a small device is even trickier, Halámek says, because some of the metabolites the researchers are measuring actually break down into similar groups of compounds. For instance, both lactate and glucose break down to peroxide. Since the electrodes to measure each are close together, there's a risk that measurements will be off; Halámek says it's particularly easy for the peroxide made from lactic acid to overcome that of glucose.
When the researchers move onto other types of metabolites for their device, calibration will also be tricky. Some metabolites are particular to certain people, and they exhibit them in various concentrations depending on their weight and biochemistry, Halámek says. Other measurements, like for glucose, won't really tell you much about your health other than the binary"good health/bad health" result you could expect from testing for glucose. Above a certain point, high glucose indicates diabetes, but what if you're already diabetic? Looking for these metabolites wouldn't be helpful unless you could instantly find out if your glucose levels are too high and you need insulin, stat—but those kinds of devices already exist.
Overall, Halámek is careful emphasize the research is sound and believes the design is promising, but he says the electrochemistry will require further research."It will be very tough," he explains."The practicality is questionable."
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