Those of us trying to lose some pounds after overindulging this holiday season can get help from a slew of smartphone apps that count steps climbed and calories burned. Self-tracking has also become a way for companies to make money using your fitness data. And some experts worry that the data collected could be used against users in the long run.
At a recent Quantified Self Meetup in downtown San Francisco, technology lovers are testing homemade do-it-yourself devices on people eager to measure their mind and body.
Charles Wong straps a belt to me that vibrates when I slouch. Jonathan Toomim slaps a Velcro headband on me, to measure my concentration according to prefrontal cortex activity. Heather Heine pokes my finger for a blood test.
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