What if we leave Free Radicals unattended?
A better question is -
What will happen if you continue losing your electrons, each day?
Your body will start decaying. That's what we call aging.
A body that does not have enough ammo to stop free radicals fast enough is losing electrons and hence losing its energy.
This energy, otherwise used for supporting immune and body, is now gone.
And there is nothing to stop all sorts of mental and physical disease and disorders from spreading in our system.