Eating spoiled food can make people sick, which is not good for people.

There are many reasons for food spoilage, which can be summarized as follows: (1) Food spoilage is caused by microbial reproduction; Due to the role of oxygen in the air, food ingredients are oxidized and deteriorated.

Because of the role of oxidase, peroxidase, amylase and protease contained in food, food metabolism is promoted, heat, steam and carbon dioxide are produced, which leads to food deterioration; Food spoilage is caused by the erosion and reproduction of insects and indirect and direct pollution of harmful substances.

Extended data

There are three main reasons for food deterioration:

1, chemical reaction of food. Oils and fats are easily oxidized, resulting in a series of chemical reactions. After oxidation, oils and fats have a strange smell, such as fat meat will turn from white to yellow.

2. Microorganisms are at work. There are microorganisms everywhere in the environment, and food is easily contaminated by microorganisms in the process of production, processing, transportation, storage and sales. As long as the temperature is suitable, microorganisms will grow and reproduce, and decompose nutrients in food to meet their own needs. At this time, the protein in the food is destroyed, and the food will smell and sour.

3, the role of enzymes. There are many kinds of enzymes in animal food. Under the action of enzymes, the nutrients in food are decomposed into many kinds of low-grade products. Usually, the rice turns sour and the fruit rots, that is, the carbohydrates are decomposed by enzymes and fermented.

Reference materials? Baidu encyclopedia-food spoilage