1. Food poisoning is generally divided into "biological type" and "chemical type". Food poisoning caused by eating expired food belongs to "biological type" poisoning. If people eat food contaminated by bacteria, viruses and parasites, it will cause acute food poisoning and even acute infectious diseases.

In order to protect citizens' health and avoid eating expired food, the state has clearly stipulated the shelf life of all kinds of food. The shelf life of food will generally be marked on cans and packaging bags, and if it is not marked, it can be calculated according to its production date. When buying food, the general public must pay attention to the production date and shelf life of food, and do not buy food without factory date and shelf life.