Eating fake salt is very harmful, because fake salt does not add iodine, which will lead to iodine deficiency, gastrointestinal dysfunction and nervous system damage. Lack of iodine in human body will cause 10% to 20% mental decline, which will seriously lead to emaciation or dementia. All the adverse effects (pathological) caused by iodine deficiency on people's physical and intellectual development are called iodine deficiency disorders. Iodine deficiency is harmful to human health, mainly manifested in the damage to children's brain development, mental retardation and poor learning ability in different degrees. Some people will also have endemic goiter, commonly known as thick neck root or big neck disease. Severe iodine deficiency will lead to endemic cretinism, which is characterized by deafness, dumb, stupidity, even abortion, premature birth, stillbirth, deformity and deafness.

The appearance of industrial salt is very similar to salt. On the surface, it is thin and white, but its composition is quite different. Among the components of industrial salt, sodium nitrite is very toxic, and it will be poisoned if you eat 0.3 ~ 0.5g by mistake. After eating 10 minutes, poisoning symptoms will appear: vomiting, abdominal pain, cyanosis, dyspnea, even convulsions and coma, which will endanger life safety in severe cases. Once the above symptoms are found, they should be sent to the hospital for emergency treatment in time. Sodium nitrite is not only toxic, but also can synthesize nitrosamines with secondary amines in human body. It has a strong carcinogenic effect and can induce tumors of various organs, especially esophageal cancer and lung cancer.