"Qingfei" concept comes from the traditional medicine. Before explaining the existence of Qingfei food, it is necessary to look at how it affects the health of airborne dust. Dust is a major factor in air pollution. Except that the concentration, particle size is a key factor of dust pollution. The smaller the particles, the greater the damage. Aerodynamic diameter greater than 10 microns can be intercepted within the nasal cilia, while smaller particles than that can be inhaled. Commonly referred to as PM10 refers to particulate concentrations in the air less than 10 microns.
If the particles are smaller than 2.5 microns, then it can be further reaches bronchioles of the lungs, where it is deposited. These sediments affect the lungs gas exchange, leading to a variety of respiratory symptoms, and even lung cancer. Because of the enormous harm it, so the air quality monitoring will specifically measure the content of particles smaller than it is well-known PM2.5.
Particles of this measure will stay in the lungs. Among those less than 0.1 microns, can be further pass through the alveoli into the blood, and as the blood flows to other organs, including the brain. They are deposited in the blood vessels can lead to hardening of the arteries, to the detriment of cardiovascular health.
The impact of these dust on the human body mainly from the physical effects. To "clear" them, you have to make "cleaner" and they meet. The food from the digestive tract into the body through the gastrointestinal digested molecules into smaller molecules. With food, like other small molecules through the intestinal villi into the blood and then be transported to cells throughout the body.
Comparison of air particles in the body with food trends, you will find food with those particles larger than 0.1 microns is no opportunity to meet, naturally could not "clear." And those very "fine" particles into the blood, in front of a small molecule of food is still the monster. Although logically can not be ruled out "mouse defeated elephant" possible, but there is no experimental evidence that these foods by small molecules to clear the dust will just good imagination.
In addition to racking our brains imagined then repeated the baseless assertion, some food, "clearing the lungs" and "based on" black stool after eating. There are similar kinds of "detoxification" food or health products, because they cause black is considered "work" of the.
Stool color does with food-related, clinically stool can also make some color and texture to speculate. The black stool is the most common reason for gastrointestinal bleeding, especially gastrointestinal ulcers or cancer. Typically, this will be sticky and smelly black.
In addition, some food, dietary supplements or drugs can also cause black stools, the most common situation is iron. For example, taking iron supplements usually will cause black stools.
Eat animal blood products, "clearing the lungs," almost all the Chinese are aware of the "recipe." Finding clinical basis of this recipe. Maybe just someone to eat pig or chicken duck cause black stools, and used as "clearing the lungs", so spread. Animal blood contains more iron, if really this phenomenon, the idea is considered normal. However, it is with the "clear lung" not really take on relationships.
(The answer from finishing scientific squirrel)
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