Mature food markets can be jump-started for growth, says global consulting and research firm Promar International .  "Contrary to conventional wisdom, companies and brands in mature markets are not necessarily destined for a slow and agonizing death," according to Promar Vice President Don Westfall.  "Abundant examples can be found where steady decline has been the case.  Yet you can also find a number of instances of companies and brands that dared to think boldly, like