High temperature and high pressure heating during canning can make fish bones brittle and soft, and a large amount of bone calcium dissolves, which greatly increases the calcium content in fish bones. Minerals such as iron, zinc and selenium are not lost.
Although canned fish can be eaten normally and is good for your health, you should not eat too much. Some fish may be polluted by heavy metals, such as swordfish and nitrile fish. And it contains a lot of salt, which is easy to increase the burden on the human kidney.
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When buying canned food, you should pay attention to the following items:
1. If the canned food is found to be swollen, convex, elastic or concave, don't buy it, because the contents of this kind of canned food may have undergone biological or chemical changes and are not suitable for eating.
2. Rusting of canned food may cause perforation of canned food, which is easy for microorganisms to enter and make food corrupt. Canned cans with scratches, twisted seams or depressions may be hit and scratched during handling or storage. In order to ensure the quality and safety, it is best not to buy this kind of canned food.
3. Pick up the can and shake it gently. If there is juice flowing out, the seal is not tight. If the seal is not tight, microorganisms can easily get in and out, which will pollute the contents. Don't buy this canned food.
The labels of some canned foods will indicate that some additives have been added to canned foods. As long as it meets the requirements, consumers can eat it with confidence, because the main purpose of adding additives is to maintain the nutritional value, flavor and appearance of food. As long as it is used properly, it will not cause harm to the human body.
5. The date of production is not the only index to judge the quality of canned food, because the quality of canned food is also closely related to various environmental factors during storage. But cans with good sealing conditions can be kept for one or two years. Some cans will also be marked with a shelf life. Don't buy it if it has expired or is not clearly marked.
People's Network-Is the nutrition of canned fish greatly reduced?
People's network-6 points to pay attention to when buying canned food.