Garbage oil is a non-edible oil with poor quality and unsanitary, and its peroxide value, acid value and moisture content seriously exceed the standard. It contains toxins, which will cause water eutrophication when flowing into rivers. Once eaten, it will destroy white blood cells and digestive tract mucosa, cause food poisoning and even cause cancer. Fried oil, one of the "vegetable oil", is repeatedly used at high temperature for a long time, and comes into contact with oxygen in the air, resulting in complex reactions such as hydrolysis, oxidation and polymerization, which increase the viscosity of the oil, deepen the color, increase the peroxide value, and produce some volatiles, aldehydes, ketones, lactones and other pungent substances, which have carcinogenic effects. According to medical research, the toxicity of aflatoxin, the main hazard in hogwash fat, is 100 times that of arsenic.

Trench-sewer is also. Gutter oil is the residue of domestic oil accumulated in sewers for many years. Many black-hearted vendors go to restaurants and other places that use a lot of cooking oil, take out the oil that people washed into the sewers from their ditches, and then reuse it directly ... Especially in Shenzhen, roadside food stalls and breakfast vendors use gutter oil obviously, and the most shocking thing is that xx frog, a large chain restaurant in Shenzhen, has also discovered the use of hogwash fat, but the Shenzhen Health Bureau has strictly controlled most regular businesses, but many roadside snacks are still very serious.

There is no obvious difference in color and taste between the mixed gutter oil and the general bulk edible oil. According to the experimental determination, the rancidity index of "gutter oil" far exceeds the national regulations. If people take it for a long time, they will lose weight and have developmental disorders, easily suffer from diarrhea and enteritis, and have liver, heart and kidney enlargement, fatty liver and other diseases. In addition, the aflatoxin produced by the pollution of waste oil is not only easy to cause liver cancer, but also can cause tumors in other parts, such as gastric adenocarcinoma, renal cancer, rectal cancer, breast cancer, ovary and small intestine.