A wristband and iPhone app help you monitor your health:
Scott Adams expects more advances in this direction:
I predict that health monitoring will be the next substantial phase of cyborg evolution. I think we'll have embedded chips to continuously monitor our blood for sugar levels, cholesterol, vitamins, minerals, salt, specific diseases, and more. I think we'll also have monitors on our bodies to tell us when our brains are at their peak levels (for thinking tasks) and when our bodies are most energetic (for exercise). Perhaps our monitors will tell us when to eat and what to eat. Monitors might tell us when we are hydrated, when we have enough fiber in our diets, and when we need more sleep. You can imagine a long list of what the monitors might tell us. The embedded monitors might be powered by your body chemistry and communicate with your smartphone when it's near.
The Dish 