Shanghai to monitor producers

As more global fast food chains rush to China for expansion, they also have to face the costly headaches in a fast-changing food supply environment plagued by repeated safety scandals.

Fast-food giant McDonald's Corp recently announced that its Chief Executive Officer Don Thompson left at the end of February, who was the former president of McDonald's USA, and took the global helm of the company in 2012.

The company has seen one of its worst financial years in decades. In addition to fighting to retain customers with changing tastes and deal with pressures resulting from political and economic turmoil in some countries, it is also facing food safety scares in China, one of its most important emerging markets.