There is a balance and contest with free radicals in the human body. Under normal conditions, the generation and scavenging of free radicals are in a dynamic equilibrium. If the operation of the antioxidant system in the body is disturbed, the excessive accumulation of free radicals will cause cell and tissue damage, and then lead to disease. At this time, we need an exogenous antioxidant to remove excess free radicals in the body, thereby preventing diseases.
Polyphenols are just the natural antioxidants we need. However, because the human body cannot synthesize polyphenols, we can only ingest them from the outside world, and plants are an important source of polyphenols for humans.
Plant polyphenols are a class of natural substances that are widely present in plants, mainly in the bark, roots, leaves and fruits of plants. Almost all plants produce a certain amount of polyphenols as anthocyanins, etc., which are also used to protect against ultraviolet radiation and protect themselves from being eaten by other animals and plants.
The plant polyphenols we often talk about mainly include flavonoids, tannins, anthocyanins, and phenolic acids. Common foods such as apples are rich in apple polyphenols, blueberries are rich in anthocyanins, and grapes are rich in resveratrol; onions, cauliflower, celery, and parsley are rich in flavonols and flavonoids; green tea is rich in tea polyphenols , coffee is rich in chlorogenic acid, dark chocolate is rich in cocoa polyphenols, etc.
Plant polyphenols have natural antioxidant, anti-inflammatory, antibacterial, antiviral, antitumor, cardiovascular and cerebrovascular protection, hypoglycemic and lipid-lowering, and intestinal flora regulation and other biological activities. Therefore, it is widely used in pharmaceutical, food, daily chemical, animal husbandry and other industries. It should be pointed out that the human body can take a large amount of polyphenols through the diet to bring about positive health effects. Some chronic disease patients can properly supplement the intake of some polyphenols, which can synergize with drug treatment and achieve better therapeutic effects. dietary polyphenols are not considered medicines.
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