The dust inhaled by the human body directly enters the lungs, but the animal blood we eat is in the large intestine. The digestive tract and the lungs are not connected to each other, so the dust in the lungs cannot be removed. However, pig blood has a detoxifying effect and can cleanse the intestines and stomach, but it cannot remove dust.

The lungs and large intestine are closely related to each other. The heart governs the blood vessels. Eating animal blood can achieve the effect of replenishing blood, and replenishing blood is replenishing the heart, so it can also have an effect on the lungs, achieving It has the effect of clearing the lungs and removing dust. Therefore, it is recommended that teachers who often write with chalk and people who work in dusty environments should eat more animal blood.