The chief culprit of "fatigue smell" is ammonia in the blood. Many women will use antiperspirant or spray more perfume to cover up the thick sweat smell, but the normal sweat smell itself is odorless. It is protein that reacts with bacteria attached to the skin surface, producing amino acids and fatty acids and releasing odor. It can usually be improved by bathing and washing clothes.
However, there is another kind of body odor, which may be caused by physical fatigue. Dr. Guan Genjia Xiang, a professor at Tokai University in Japan, specializes in human skin and odor. She pointed out: "There is a smell that smells like ammonia (urine smell). It is a gas produced by the skin. When it diffuses into the air, it is considered as an odor. 」
This fatigue smell actually comes from blood. When people feel tired and nervous, the content of "ammonia" in the blood will increase, which should be excreted with urine, but "ammonia" becomes easy to accumulate in the blood, making the whole body emit the smell of ammonia and causing body odor.
Professor Guan Genjia Xiang further analyzed that there are three reasons for the increase of ammonia in blood.
People who like to eat meat and fish: Because protein will be absorbed by the human body, ammonia will be produced during its decomposition into amino acids. Overworked and overworked people: when muscles recover from overwork, ammonia will also be produced when amino acids are decomposed, although the direct relationship between psychological stress and ammonia has not been clarified yet. However, the results show that ammonia production and psychological stress increase at the same time. People who drink too much: The function of liver is to convert ammonia into urea, but if drinking too much leads to the decline of liver function, it will not only make people feel tired, but also worsen the intestinal environment and promote the production of ammonia in the intestine. The problem of improving excessive ammonia body odor in three steps of life puzzles many people and can only be changed through daily life. In view of the problem of body odor, Guan Genjia Xiang suggested the following ways to improve it:
Avoid overeating: Objective To maintain the intestinal environment, it is very important to avoid overeating. In particular, the so-called "Bifidobacterium" in the large intestine is a good bacterium in the intestine, so that the interior of the large intestine will remain weakly acidic and will not produce alkaline ammonia. You can choose to eat more water-soluble dietary fiber. Take a bath instead of a bath: Soaking the body with hot water will help to transport blood back to the body, activate heart function, promote blood circulation, and also allow fresh oxygen to be transported to all parts of the body, thus eliminating body fatigue and washing away odor. Exercise for 30 minutes every day: if the sweat glands are unhealthy, the sweat flowing out is beneficial to the bacterial reproduction on the skin and easy to produce odor. Regular exercise every day is not only helpful for sweating, but also helpful for exercising sweat glands, and it is also a way to relieve physical and mental stress. Guan Genjia Xiang said: "At least 300 kinds of gases can be produced on the surface of human skin. Just like people farting, there may be body odor problems regardless of age, especially when there are problems such as lack of sleep and fatigue. " If you want to improve yourself, you might as well start with your own diet.
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Present position: Professor, Department of Chemistry, Faculty of Science, Tokai University, Japan; Lecturer, Graduate School of Governance, Keio University * * * Major: Interdisciplinary research on biogas (especially skin gas) and atmospheric environment.