BEIJING - Gao Pingping, a 30-year-old mother in East China's Anhui province, fed her 2-year-old son Meiji milk powder until the Japanese company announced that radioactive cesium was found in the product last December.

"I'm not sure whether the milk powder I bought was tainted, or how to deal with the milk powder I still have," she said.

The dilemma Gao faced is one shared by the growing numbers of Chinese people opting for imported food.