In the past, when people made preserved eggs, in addition to adding salt, tea powder and alkaline substances, such as quicklime and plant ash, they also added lead oxide. Will cause lead to be contained in preserved eggs.

Regularly eating foods containing excessive amounts of lead will accumulate lead in the body, thereby harming the hematopoietic system, affecting the hematopoietic function of the bone marrow, and causing a decrease in human immunity. At the same time, excessive accumulation of lead in the body can also cause damage to the nervous system. In mild cases, it can cause slow thinking and poor nervous system stability, and in severe cases, it can cause neurological disorders.

Extended information:

With the advancement of technology, the lead oxide used in making preserved eggs has been replaced by zinc and salt, and compared with preserved eggs made by traditional techniques, its The taste is not bad.

In fact, "lead-free preserved eggs" are not really lead-free, but the lead content is much lower than before after improving the process. Although the new process reduces the lead content in preserved eggs, it cannot make them completely lead-free. Therefore, truly lead-free preserved eggs do not exist. It can be seen that preserved eggs should not be eaten too much.

Generally speaking, normal people should try to avoid eating preserved eggs every day, and try not to eat more than one at a time; patients with high blood pressure, high cholesterol, liver and kidney diseases, children, pregnant women, and the elderly should Eat less or no preserved eggs.

People's Daily Online - Are lead-free preserved eggs really free of lead? Experts say: There is no such thing as lead-free preserved eggs