[carapace]

If you thought Google knew a lot about you before...

There are massive potential benefits to mass medical data collection and analysis. From early detection and prevention of epidemics to individualized, detailed, precise medical advice (e.g. you, specifically, might be fine eating lots of fat, but have an obscure risk factor involving, say, olives or almonds or something.)

To me it seems clearly insane to give that much power to such a relatively unaccountable entity.

There's a competitor to Fitbit and one thing coming down their pipeline can detect blood alcohol level. They are about to enter a market in a staunchly Muslim nation. See the potential for problems?