Puffed food itself, its nutrition is not comprehensive, it has four high characteristics: high sugar, high fat, high calorie, and then high monosodium glutamate content, eating too much will destroy the nutritional balance. Moreover, puffed food is easy to cause satiety, which will affect normal eating and hinder the body's absorption of nutrients. During the production of puffed food, lead will enter the food. Puffed food usually has a high lead content, which mainly comes from the following aspects: some food additives like leavening agents; Food is processed through metal pipes. Metal tubes usually contain alloys of lead and tin. At high temperature, lead will vaporize, and vaporized lead will pollute these puffed foods. The harm caused by lead is obvious, mainly manifested in the behavior of some nervous systems. For example, inattention, poor memory, impulsiveness, temper tantrums and so on. However, if the dose is large and the poisoning degree is deep, it will seriously endanger the development of intelligence and the health of nervous system.