Canned food as here https://www.sbcanning.com/ is included in the diet of almost every person. They can be eaten immediately without additional processing. Initially, they were invented as a strategic product for the needs of the army, campaigns, and a supply of food for a long time. Canned food can be stored for a very long time, is distinguished by a large number of calories and nutrients. Now it is often purchased for daily use. Eating canned food every day is strictly not recommended if there is access to fresh produce. In order to ensure the long-term preservation of the contents of the jar, preservation includes heat treatment at high temperatures. In the process, various harmful bacteria are destroyed, but useful substances are also lost. In most cases, canned food contains fewer benefits than fresh food, but with one exception - vegetables. It has been proven that antioxidants such as lycopene and beta-carotene increase their properties during sterilization. Fish. The product contains zinc, calcium, selenium, phosphorus, vitamins B and D. These microelements have a beneficial effect on the nervous and cardiovascular systems, help to strengthen the immune system. Fish contains a large amount of protein. Tuna is especially useful in this sense - its protein is absorbed by 95%. Most of the vitamin D and omega-3 acids are found in canned cod liver. The advantage of canned fish is its high calcium content. The composition usually includes ground or softened bones, which are a direct source of this trace element. Nutritionists recommend purchasing fish in its own juice, without flavorings, tomato paste and vegetable oil. It is most beneficial for the body.