An employee works at the production line of an edible oil company in Sanhe, Hebei April 12, 2011. Image for illustrative purposes.

Employees work at a production line prior to a seizure conducted by officers from the Shanghai Food and Drug Administration, at the Husi Food factory in Shanghai, July 20, 2014. A watchdog closed Shanghai Husi Food Co Ltd, a local unit of OSI, and seized meat products suspected of being beyond their expiration date, according to a statement on Monday from the Shanghai Municipal Food and Drug Administration. Picture taken July 20, 2014. REUTERS/Stringer

A worker places ginseng on a shelf at a ginseng processing factory in Baishan, Jilin province, September 22, 2014. China's manufacturing sector unexpectedly picked up some momentum in September even as factory employment slumped to a 5-1/2-year low, a potential source of worry for Communist leaders who prize social stability above all else. Picture taken September 22, 2014. REUTERS/Stringer

Image used for illustrative purpose. A labourer works at the production line of a local dairy factory in Hefei, Anhui province September 23, 2008.

A boy rides a bicycle in between home-made rice noodles in Changting county, Fujian province, August 18, 2013. Picture taken August 18, 2013. REUTERS/China Daily

Labourers work in a paddy field on top of a wine factory, Liujiang county, Guangxi ethnic Zhuang autonomous region, October 16, 2013. According to local media, the factory planted two mu (0.33 acres) of rice on the rooftops of its building, where the special environment has allowed the crops to avoid weeding, plant diseases and insect pests for three years. Picture taken October 16, 2013. REUTERS/Stringer

An employee makes stuffed steamed buns at a food factory in Yangzhou, Jiangsu province January 8, 2014. China's annual consumer inflation slowed to 2.5 percent in December from the previous month's 3 percent, official data showed on Thursday, slowing more sharply than market expectations. Picture taken January 8, 2014. REUTERS/Stringer

Employees process meat along a production line at a factory of Shuanghui (Shineway) Group in Luohe, Henan province, June 17, 2013. China's WH Group Ltd, the world's biggest pork company previously known as Shuanghui International Holdings, has launched a Hong Kong initial public offering of as much as $5.3 billion in the second-largest ever IPO by a food and beverage company. Picture taken June 17, 2013. REUTERS/Stringer

An employee works along an assembly line at a liquor factory in Taiyuan, Shanxi province August 10, 2012. Baijiu makers Kweichow Moutai Co Ltd and Wuliangye Yibin Co Ltd paid out huge dividends and raised earnings forecasts when a slowing economy had prompted dozens of Chinese firms to issue profit warnings. REUTERS/Stringer

Workers hang dried fish onto poles at a processing facility on the outskirts of Hangzhou, Zhejiang province December 25, 2012. REUTERS/Lang Lang

A woman works at a conveyor belt carrying eggs to packaging at Deqingyuan ecological farm on the outskirts of Beijing, China, September 10, 2015. Picture taken on September 10, 2015. To match Insight CHINA-CLIMATECHANGE/ REUTERS/Kim Kyung-Hoon - RTS628G

Employees peel shrimps along a production line at a seafood factory in Rizhao, Shandong province March 2, 2011. Inflation in China will probably ease in February because government steps to curb price growth are beginning to work, the country's top economic planner said on Monday. REUTERS/Stringer

An employee works at a production line prior to a seizure conducted by officers from the Shanghai Food and Drug Administration, at the Husi Food factory in Shanghai, July 20, 2014. A watchdog closed Shanghai Husi Food Co Ltd, a local unit of OSI, and seized meat products suspected of being beyond their expiration date, according to a statement on Monday from the Shanghai Municipal Food and Drug Administration. Picture taken July 20, 2014. REUTERS/Stringer

Moulds of Oreo cookies are seen in a laboratory of a Kraft Foods' factory in Suzhou, Jiangsu province, May 30, 2012. Investment may be powering the Chinese economy but experiments like Oreo's gum cookie, a cookie with a glob of gum sandwiched neatly between a pair of Oreo's iconic dark chocolate biscuits instead of the creamy white "stuff", which for better or worse never made it to store shelves, are a reminder that consumption is rising sharply. That means it is vital for food companies to get the right products into the market, particularly with demand dimming in the United States and Europe. Picture taken May 30, 2012. To match story CHINA-LOCALISATION/OREOS REUTERS/Aly Song

Employees work inside a beer factory in Shenyang, Liaoning province, October 14, 2013. Factory-gate deflation eased further in September, although in annual terms prices still recoded a 19th consecutive fall. REUTERS/Stringer

Workers use their feet to spread freshly harvested coffee beans to dry at Fushan Coffee Plantation in Chengmai county, Hainan province December 3, 2010. Approximately 120,000 local residents in the county are working in jobs relating to coffee production, with an annual production capacity of 200 tonnes coffee beans, local media reported. Picture taken December 3, 2010. REUTERS/Sheng Li

Over ten thousand pieces of shark fins are dried on the rooftop of a factory building in Hong Kong January 2, 2013. Local sales of the luxurious gourmet food have fallen in recent years due to its controversial nature, but activists demand a total shark fin ban in the city, labelled by some as the shark fin capital of the world. The fins were shipped from an unknown location and unloaded at a nearby pier to be dried on the rooftop. REUTERS/Bobby Yip

Employees work at a production line of a chicken processing factory in Shenyang, Liaoning province, August 9, 2014. Image for illustrative purposes.

A worker carries and inspects lettuce plants growing under artificial lights and in a liquid solution at China's first computer-controlled greenhouse seedling factory located on the outskirts of Beijing August 27, 2010. The factory will supply 15 million pesticide-free vegetable, fruit and flower seedlings to domestic growers per year, Xinhua News Agency reported. REUTERS/David Gray

Employees stand during a seizure conducted by officers from the Shanghai Food and Drug Administration, at the Husi Food factory in Shanghai, July 20, 2014. A watchdog closed Shanghai Husi Food Co Ltd, a local unit of OSI, and seized meat products suspected of being beyond their expiration date, according to a statement on Monday from the Shanghai Municipal Food and Drug Administration. Picture taken July 20, 2014. REUTERS/Stringer

Freshly-baked Oreo cookies pass along a conveyor belt at a Kraft Foods' factory in Suzhou, Jiangsu province, May 30, 2012. Investment may be powering the Chinese economy but experiments like Oreo's gum cookie, a cookie with a glob of gum sandwiched neatly between a pair of Oreo's iconic dark chocolate biscuits instead of the creamy white "stuff", which for better or worse never made it to store shelves, are a reminder that consumption is rising sharply. That means it is vital for food companies to get the right products into the market, particularly with demand dimming in the United States and Europe. Picture taken May 30, 2012. To match story CHINA-LOCALISATION/OREOS REUTERS/Aly Song

Image used for illustrative purpose. Employees work inside a milk factory in Beijing, July 5, 2013. China's annual consumer inflation accelerated more than expected in June but factory-gate deflation persisted for a 16th month, underscoring the policy dilemma facing the People's Bank of China as it worries about long-term price risks even as economic growth slows. The central bank is seen keeping policy largely neutral in the near term to balance the need to keep the world's second-largest economy on an even keel while warding off inflation as well as possible property bubbles, analysts say. Picture taken July 5, 2013. REUTERS/Stringer

Freshly-baked mooncakes pass along a conveyor belt at a mooncakes factory in Shanghai September 12, 2013. With more calories than a Big Mac, mooncakes are traditionally given as gifts to family, friends and employees during China's Mid-Autumn Festival, which falls on Sept. 19 this year. But an anti-corruption drive by President Xi Jinping has left the pricier treats languishing on the shelves, shopkeepers and analysts say, even as sales of more traditional lotus seed- and sesame paste-stuffed varieties remain unhurt. Picture taken September 12, 2013. REUTERS/Aly Song