Frozen vegetables and other hazards are reduced nutritional value, improper preservation will also produce harmful substances. Fresh vegetables in the fiber and vitamin content is relatively rich, if not cleaned or long-term frozen will lead to the loss of nutrients, but also reduce the taste, lost the value of use. If the vegetables deteriorate or rot during the freezing process, harmful substances will be produced, and after eating them, there will also be adverse phenomena, such as diarrhea or abdominal pain and so on. In daily life is not recommended to eat frozen vegetables, you can eat more fresh vegetables, storage time should not be too long, to ensure that the nutrients are fully intake and absorption. If abdominal pain or nausea or vomiting occurs after using frozen vegetables, consult a doctor immediately for prompt treatment under the guidance of a doctor.