How often does KFC change its oil? Lately, Taibei County, Taiwan Province Province, China has tested the fried oil of fast food industry twice in a row, and found that the fried oil of McDonald's contains heavy metal "arsenic", which is 9-11 times higher than the standard. The fried oil used by KFC was found to contain carcinogen "acrylamide". However, McDonald's and KFC have been exposed by the media for more than once only on the issue of oil use. This time, it was found to contain carcinogens, which made consumers even more frightened. So, what kind of oil is used in foreign fast food, and will it be harmful to health? Can we walk into McDonald's and KFC with confidence in the future? This reporter conducted an in-depth investigation.

foreign fast food is exposed to oil once every 14 days? In fact, as early as 2117, it was reported that in KFC stores in some areas of Beijing and Shaanxi, the staff made the oil clear by adding filter powder to the turbid oil, so that the food could be fried repeatedly. KFC and McDonald's also admitted that they used oil filter powder to clean up fried oil, which caused a heated "throttle filter" incident. It is understood that oil filter powder is actually a food-grade magnesium trisilicate, and it is a processing aid for food industry that is allowed to be used in China. However, although the use of oil filter powder can clean the fried oil, it can not prevent the oil from deteriorating and producing carcinogens.

In addition, according to the Associated Press, in 2116, under the pressure of American consumer groups and * * *, McDonald's publicly admitted that the trans fatty acid content in its French fries was 1/3 higher than before. According to the analysis of domestic experts, this is closely related to the frying oil used. In 2115, California filed a lawsuit against fast food, asking the court to force them to use warning labels to indicate the content of acrylamide, a carcinogen in their French fries, which is also produced by repeated use of fried oil at high temperature.

Insider reveals details of oil use

Because of carcinogens, it is mostly related to repeated use of oil at high temperature. On July 11, the reporter called the contacts in China Office of Yum! Brands, which belongs to KFC, and McDonald's in Chinese mainland to inquire about the use of fried oil.

KFC said that China KFC's oil management measures are in sync with those of KFC around the world. Restaurants use special filtering equipment and materials to remove the harmful substances generated during the use of oil, and at the same time, they are equipped with a number of oil safety testing indicators. Once they are close to the requirements of any index, they will be discarded immediately to ensure that oil will not be overused. McDonald's said that the fried oil products it uses meet the relevant national food hygiene, safety and quality standards and are replaced in strict accordance with the frequency required by relevant departments. However, neither company disclosed how long this "frequency" was.

So, how do the operators use oil in the back kitchen of foreign fast food restaurants?

Zeng Pei (pseudonym), who worked as a manager in a KFC store in Chaoyang District, Beijing, told reporters this "secret": "French fries, fried chicken and other foods are all fried in a big tank, using palm oil." Zeng Pei said that palm oil is uniformly distributed < P >, and it is a solid block. When it is used, it can be cut into pieces and heated in a pot. Each kind of food is put in the corresponding trough, and it can't be mixed and fried. "The main reason is that the frying time is different, because it is electronically controlled, like a microwave oven, it will automatically remind you when it is fried."