Oxidation is a chemical reaction that can release energy. As far as we can see, the burning of wood is oxidation, and the burning of wood releases heat and light energy.
In the invisible place, our human body is also oxidized every moment, because we need energy every day. When the oxidation reaction occurs in the cell and energy is released, a substance called free radical is also produced.
So where do free radicals come from and what are the harms.
Free radicals in the human body mainly come from the following sources: Ultraviolet rays: When ultraviolet rays are irradiated to objects on the earth, they will produce highly active active oxygen free radicals. Radiation: The reactive oxygen free radicals produced by radiation can cause cell damage and are the culprit of DNA damage. Chemical substances: mainly refers to some herbicides, insecticides, some medicines, etc. Mental stress: Stress can cause poor blood circulation, present a hypoxic state, and stimulate free radical production. Smoking: There are a lot of free radicals in cigarette smoke and tar.
Free radicals can directly or indirectly cause many problems: Aging: In the natural metabolism of the human body, the random destruction of free radicals leads to aging. This is the central content of the free radical aging theory. Heart disease: When a heart attack occurs, most of the damage to the heart muscle is caused by the outbreak of free radicals caused by blood reperfusion. Eye diseases: Free radicals can cause direct damage to the lens. Age-related eye diseases are closely related to free radicals, especially cataracts. Cancer: Many carcinogens produce free radicals in the metabolic process, which then attack DNA and eventually cause cancer. Decreased immune function: free radicals act on the immune system or lymphatic system to damage it.
How is anti-oxidation achieved?
Free radicals can attack tissues and cells, especially the DNA in the nucleus, causing harm to the human body.
Ultraviolet rays, pressure, chemicals, pressure...every free radicals are produced so close to us.
Free radicals are continuously formed everywhere in the body, and antioxidants play a positive role in reducing the damage.
Of course, one thing to clarify is that free radicals are not useless. Many physiological activities of the human body also depend on the effects of free radicals, such as blood flow, fighting colds, mental concentration and so on.
Where there is life, there are free radicals. Without free radicals, we cannot exist.
Therefore, what we usually call anti-oxidation is actually maintaining the balance between oxidation and anti-oxidation.
Antioxidant master-tea polyphenols
Tea polyphenols account for 18%-36% of the dry weight of tea.
Research on tea polyphenols began in the 1950s. It can protect the body's genetic material DNA from being damaged by free radicals during the process of replication.
Vitamins are good antioxidants, however, the power of tea polyphenols is far above them.
The antioxidant capacity of tea polyphenols is 6-7 times that of vitamin E and 5-10 times that of vitamin C.
At present, a very important aspect of tea anti-cancer, anti-radiation and anti-aging research is the anti-oxidant function of tea. Therefore, tea polyphenols are also called "natural body preservatives".
Drinking tea has many benefits. Both Time Magazine and Time Magazine recommend tea as an antioxidant food or nutrient.
I believe that as the world's attention to tea and health continues to increase and research is deepened, tea as a welfare will benefit more and more people.