Toning up essentially revolves around
shedding enough body fat so that the definition and shape of your muscles becomes visible, given that you've put some effort into increasing their size.
True starvation is a clinical condition where the
body simply does not receive
enough nutrients to support life - basic systems begin to shut down, the
body begins to
shed all skeletal muscle and consume even essential bodyfat, and the eventual result is organ failure and death.