Comment by gagege

I have an idea for a novel about this, I'm just not a good writer.

Basically, you ingest food and something in it collects data and can show you advertisements (or whatever) based on your eating habits. You wouldn't even have to know you've eaten the stuff (the nano-machines or whatever) but you'd start seeing ads because the nano-machines have attached themselves to your eyes and are creating images for you to see. How do you know what's real, then?

We don't have that technology yet (AFAIK), but this is just one step beyond a few current technologies (Google Glass + nano-machines?) and an extension of the path of privacy invasion via technology we're currently on.

This might just sound like crazy science fiction paranoia but I'm pretty sure we'll see something like this happen in the next 100 years.