Quantified Self - that's the name of a movement that began in the US, and is rapidly gaining adherents in Germany. With the help of portable computer devices, self-trackers measure a wide range of bodily functions, from heart rate to posture, and post the results on line to compare with their friends.
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Are they little more than control freaks, or do Quantified Self members actually live healthier lives? We look at the medical and privacy issues that new technology is opening up.