Sentry for Human Body
Use a similar approach to what high-availability software systems use.
Thing like Sentry gives the warning signals and notifications for developers, if any errors occur in production systems.
Knowing the optimal states of various human body characteristics, we could think of creating something like the Sentry (an early warning system) for human body. Rather than waiting until the measurement of some parameter will go out of norm, we could be warned immediately, once it starts diverging from norm, and help keep bodies at their optimal.