Physiological function of fluorine
Fluorine plays an important role in the formation of bones and teeth. Appropriate amount of fluorine is beneficial to the utilization and deposition of calcium and phosphorus in bones, accelerating and promoting the growth of bones and maintaining the health of bones.
After fluorine is absorbed by light apatite in enamel, a hard and acid-resistant fluorapatite protective layer is formed on the tooth surface.
fluorine deficiency
When fluoride is deficient, the enamel can't be protected because it can't form fluorapatite, and the enamel is easily eroded by microorganisms, organic acids and enzymes, leading to dental caries.
In addition, the utilization of calcium and phosphorus will also be affected, which will lead to osteoporosis.
Fluorine excess
Excessive intake of fluoride can lead to acute or chronic fluorosis. Symptoms and signs of acute fluorosis include nausea, vomiting, diarrhea, cardiac insufficiency, convulsion paralysis, syncope, etc., which are more common in special working environment. Chronic fluorosis mainly occurs in high fluorine areas, which is caused by long-term intake of excessive fluorine, mainly damaging bones and teeth. Its clinical manifestations are dental fluorosis and skeletal fluorosis.
Dietary reference intake
The reference intake of dietary fluoride proposed by China Nutrition Society in 20 13 years is adult1.5 mg/d.
Fast absorption of fluorine and high absorption rate. Fluorine in drinking water can be completely absorbed, and the general absorption rate of fluorine in food is 75%~90%.
Food source:
Generally speaking, the fluorine content in animal food is higher than that in plant food, the fluorine content in marine animals is higher than that in fresh water and land food, and the fluorine content in fish and tea is high.