Ubiquitous self-bio-monitoring

We can take EKG, EEG, pulse, tension, and a lot of other measurements. We have lie detectors. We can test ourselves for blood sugar rates. We have the idea of neurofeedback. We've had Polar pulse meters for a long time.

We have also had a clear miniaturizing trend for a long time, and we're starting to make more and more things able to communicate wirelessly.

With all this stuff going on, it feels logical that we'll eventually have a portable self-meter device which can give us constant feedback on our physical (and eventually brain?) state.

First, because it's fun to know. Second, because it can help significantly to maintain a healthy lifestyle, and with the current trend towards obeseness in the world that's sorely needed. And of course, it can be integrated with medical care to enable remote monitoring of patients, providing a detailed log on entering a hospital, or what have you.

I see three four big issues to overcome:

- Integrity; the persistent log of the information must be very secure, as would any wireless publication interface (e.g. sending signals from a monitor to a mobile phone). It would probably not be desirable if our insurance company got their hands on the info, for example. (Or would it - is it correct/ethical to withhold things from your insurance company?)

- Interface: How to present the information in a way which is unintrusive but "always-on"? Visual, aural, ...? Send to mobile phone, show in augmented-reality goggles, beep in ear, or what? The mobile phone feels like the most obvious short-term solution.

- Miniaturization: For this to really become popular, the detector component must be small enough to be carried without discomfort; a wrist watch or so. How to fit all the required components into there? Or further on, when we get that far, the various detectors could just be implanted in suitable places in the body. If so, it would be very nice with batteries that can be recharged via induction. Like my electric toothbrush. Or via kinetic energy.

- Economy: Can this be manufactured for a suitably low cost and in a presentation package which makes it attractive to the general public?

What's a likely timespan for every man's gadgets like this to appear... 10 years? Let's aim for 2020. Will This Happen?

Update 2016: Fitbit, Garmin, Polar, etc and sensors in mobile phones are now becoming mainstream. We're making good progress!