US fast food chain Subway is investigating media reports in China that workers at a Beijing outletdoctored food labels and used produce beyond its expiration date, a spokeswoman for the company said in Shanghai on Monday.

近日媒体曝出北京一家赛百味的员工篡改食品标签并使用过期食材，对此赛百味快餐连锁公司在上海的一名女发言人周一称赛百味美国总部正对此进行调查。

“篡改食品标签”的英文表达就是doctor food labels，目的是使用过了expiration date(保质期)的食材。这几年来国内外的food safety scandals(食品安全丑闻)可谓是此起彼伏。

另一个快餐巨头麦当劳因被卷入福喜过期劣质肉事件业绩受到冲击，导致same-store sales(同店销售额)下滑。