Canned food is a common food. During the processing, the vitamins in the raw materials will be destroyed and the proteins will be denatured. Whether it is canned fruit or canned meat, the nutrition in it is less and the calories are more. Usually, eating a small amount of canned food will not harm the body, but if you eat a large amount of canned food, it may be harmful to the body, such as increased blood sugar, aggravated gastrointestinal discomfort, and obesity.

If you eat a small amount of canned food, the body absorbs less sugar in canned fruit and fat, salt and other substances in canned meat, which is generally not harmful to the body. If you eat a large amount of canned food, because canned fruit is made by adding a lot of sugar to pickled fruit, the water-soluble vitamins of the fruit have been destroyed after pickling. Eating too much may cause a sudden rise in blood sugar, which is not conducive to disease control for diabetic patients. There is more sugar in canned fruit, which will stimulate the mucosal cells to secrete gastric acid, and then cause heartburn, nausea and other conditions. In addition, if the body's absorption rate of sugar increases, it may cause the body's energy to be unable to be consumed, and then obesity will occur. Canned meat may contain preservatives, nitrites and other ingredients, which can irritate the gastrointestinal mucosal wall and easily aggravate stomach discomfort. In addition, a large amount of nitrite intake may also cause body poisoning, so eating too much canned food is harmful to the body.

If the can is not sealed well, it may also cause secondary pollution after leaving the factory. External pollutants and particulate matter enter the can and react with the substances in the can to produce harmful substances. It is recommended to use fresh fruits, meats and vegetables instead of canned food in life.