We have to digest everything we eat. Many of them will be digested to the basic unit before they can be absorbed by the human body. Frozen food will change the food structure, making local substances degrade and synthesize, but it is difficult to change the structure of small molecules. From this point of view, quick-frozen food basically does not affect food or has little impact.

Some substances are easy to inactivate during freezing and thawing, which will reduce the of local substances. These are generally more sensitive substances, such as antibodies and unknown bioactive substances. This is mainly some novel foods, such as milk and fruit. I believe that ordinary people will not freeze milk and fruit, so there is no need to think about it.

The main reason for the impact of quick freezing is not the quick freezing itself, but the cold chain storage in the sales chain. Ordinary quick freezing request cannot be frozen during transportation and storage. However, in many supermarkets in small cities, villages and even big Shanghai, it is impossible not to freeze and thaw. On the one hand, freezing and thawing will affect a small amount of food. The main thing is that microorganisms will multiply in the process, which will seriously affect the peace and security of quick-frozen food. Therefore, when purchasing quick-frozen food, you should pay attention to the choice, not those that are obviously frozen (those that are not frozen should adhere to good sales, such as not caking)