Medical experts point out that food, especially cooked food, is often easy to deteriorate after being packed in plastic bags. People who eat this spoiled food are prone to food poisoning symptoms such as vomiting and diarrhea. In addition, the plastic itself will release harmful gases, which will accumulate in the sealed bag for a long time, and the concentration will increase with the increase of sealing time, resulting in different degrees of pollution of food in the bag, which has a particularly prominent impact on the healthy development of children.

A. The plastic bags with particularly dark colors that are often used in street stalls are extremely harmful. Processed from recycled waste plastic products, it is extremely harmful to human body and cannot be used to package direct food; In addition, PVC plastic products can not be used to store alcoholic food and oily food, otherwise the lead in the bag will dissolve into the food; At the same time, this kind of plastic bag can't hold food with a temperature above 50℃.

B Insiders pointed out that most of the plastic bags currently sold and used in the market are produced by small enterprises or family workshops in various places, and a considerable part of them are recycled plastic products. Waste plastics, industrial wastes and plastic wastes discarded by medical institutions collected by garbage stations are recycled, processed into food bags privately, and put into the market without disinfection. These recycled plastics contain bacteria and carcinogens that seriously exceed the standard. Using this plastic product to package cooked food directly into the mouth will have extremely serious consequences for consumers' health. This kind of plastic bag contains a lot of invisible bacteria, and long-term use of this disposable plastic food bag can easily lead to chronic food poisoning.

C nowadays, most of the breakfast stalls are transparent and low-priced plastic film bags, mostly made of pvc (polyvinyl chloride), and most of them are recycled materials. The production of recycled plastic bags is the secondary utilization of plastics, which can save costs, reduce white pollution and bring great benefits to the environment and society. At the same time, it also greatly facilitates people's lives and is an indispensable item in people's daily life. However, using recycled plastic bags to package food is far from it. This kind of plastic bag filled with PVC will release toxic substances such as lead at high temperature. When the temperature exceeds 50℃, toxic components in plastic bags will seep out, thus polluting food and causing harm to human body. When the temperature reaches 80℃, it will be melted by heat and release toxic substances. The temperature of hot (cooked) vegetables is above 40℃, while the temperature of fried dough sticks and freshly cooked soybean milk is around 90℃. With the increase of temperature, the activities of toxic substances in plastic bags are intensified, which are easily absorbed by food and enter the stomach of consumers. After a long time, it will inevitably cause chronic poisoning of consumers.