Fast-food chains must disclose suppliers

Gu Zhenhua, a food safety expert and vice-president of the Shanghai Municipal Food and Drug Administration, said chain restaurants are obliged to disclose information on their suppliers because consumers are entitled to know where their food comes from.

"Consumers are paying based on their trust in the brands. And brands need to make their foods traceable," said Gu.

Consumers said they expect the requirement to expand to all catering services in the city.

"The Husi scandal impacted consumers' confidence in some food chains, and the measure of disclosing supplier information may help to restore that confidence," said Bai Lingyun, a 34-year-old Shanghai resident.