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Analysis:

Vitamin C, also called ascorbic acid, is a water-soluble vitamin. Among all vitamins, vitamin C is the most unstable. It is easy to be destroyed during storage, processing and cooking. It is also easily oxidized and decomposed.

First, the main physiological functions of vitamin C

1, promoting the biosynthesis of collagen. Conducive to faster healing of tissue wounds;

2, promote the metabolism of tyrosine and tryptophan in amino acids, and prolong the life of the body.

3. Improve the utilization rate of iron, calcium and folic acid.

4. Improve the metabolism of fat and lipids, especially cholesterol, and prevent cardiovascular diseases.

5. Promote the growth of teeth and bones and prevent gum bleeding. ;

6, enhance the body's anti-stress ability and immunity to the external environment.

Two. Vitamin c deficiency and diseases

When vitamin C is deficient, its symptoms are as follows:

1. Gum swelling and bleeding, gum ulceration, loose teeth.

2. Skeletal deformity, easy to fracture.

3. The wound is difficult to heal. Further, it will cause scurvy and anemia.

4. Hemorrhage and heart failure may lead to sudden death in severe cases.

5. Decreased muscle fiber, including myocardial decline.

Vitamin C is a non-toxic nutrient, but it will be harmful if it is consumed more than 8 grams a day. Symptoms include nausea, abdominal cramps, diarrhea, excessive iron absorption, destruction of red blood cells, increased bone mineral metabolism, blocked anticoagulant therapy, increased plasma cholesterol, and possible dependence on large doses of vitamin C.

3. What are the main food sources of vitamin C?

Kiwi, cherry, citrus fruit, guava, green or red pepper, tomato, mustard, spinach, strawberry, cabbage, potato, grape and tomato.

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Vitamin C, also known as ascorbic acid, is a water-soluble vitamin. Vitamin C is an antioxidant, which plays an important role in biological redox process and cell respiration. Vitamin C participates in amino acid metabolism, neurotransmitter synthesis, collagen synthesis and interstitial tissue synthesis, and has the functions of reducing capillary permeability, coagulation, increasing anti-infection ability, detoxification, antihistamine and preventing carcinogen production. This product is used for supplementing nutrition and treating scurvy, gingival swelling and gingival bleeding, as well as for various acute and chronic infectious diseases or other diseases to enhance resistance, recover after illness and heal wounds, and also for adjuvant treatment of allergic diseases. However, in recent years, according to the research at home and abroad, due to the increasing dosage of vitamin C, there are more and more adverse reactions, which cannot be taken lightly. Adverse reactions are described below.

Diarrhea Taking1~ 4g of vitamin C every day can accelerate the peristalsis of small intestine and cause abdominal pain and diarrhea.

Gastrorrhagia: Long-term oral administration of vitamin C can cause nausea and vomiting. At the same time, due to the increase of gastric acid secretion, it can aggravate the pain of gastric and duodenal ulcers, and in severe cases, it can also lead to gastric mucosal congestion and edema, leading to gastric bleeding.

After a large amount of vitamin C in the stone enters the human body, most of it is metabolized by the liver, and the final product is oxalic acid, which is excreted from the urine to become oxalate; Studies have found that taking 4 grams of vitamin C orally every day, the content of oxalate in urine will surge from 58 mg to 620 mg within 24 hours. If you continue to take it, oxalate will continue to increase, which will easily lead to urinary calculi. In addition, vitamin C is acidic, which can increase the concentration of uric acid, thus contributing to the formation of stones.

Taking a large amount of vitamin C for a long time in anemia can reduce the absorption of vitamin B 12 in the intestine and aggravate the condition of megaloblastic anemia. If the patient is congenitally deficient in glucose -6- phosphate dehydrogenase, taking more than 5 grams of vitamin C every day will lead to the rupture and hemolysis of red blood cells, leading to anemia, which will be life-threatening in severe cases.

Gout gout is a disease caused by purine metabolism disorder in the body, which is mainly manifested in the high concentration of uric acid in the blood, leading to a series of symptoms in joints, connective tissues and kidneys. Taking a large amount of vitamin C will lead to a sharp increase in uric acid and induce gout.

Intravenous injection of vitamin C in phlebitis can cause dizziness or fainting. Moreover, drugs have a * * effect on the blood vessel wall, and long-term use will cause phlebitis and even thrombosis.

Women who have had induced abortion due to menstrual bleeding should take a large amount of vitamin C, such as 6 grams a day, which will cause menstrual bleeding after three days.

Babies rely on pregnant women to take a lot of vitamin C continuously, which will make the fetus dependent on this medicine. After birth, if you don't give your baby a lot of vitamin C supplements, scurvy may occur, such as listlessness, gingival swelling and bleeding, subcutaneous bleeding, etc. There are even symptoms such as gastrointestinal bleeding and urinary tract bleeding.

Infantile dyspepsia: A large intake of vitamin C by breastfeeding infants may cause anxiety, insomnia and indigestion.

Children with orthopedic diseases who take a large amount of vitamin C can suffer from orthopedic diseases with a high incidence.

Long-term use of a large number of vitamins by infertile women of childbearing age (for example, when the daily dose exceeds 2 grams) will reduce fertility.

Taking a large amount of vitamin C for a long time due to immune deficiency will reduce the phagocytosis of white blood cells and reduce the body's disease resistance.

When vitamin C is used in large quantities for a long time, the drug concentration in blood acid will be lower than that of normal people. This is because after the body is "overloaded", it changes the regulatory mechanism in the body and accelerates the decomposition and excretion of vitamin C. If it stops suddenly, the body will still maintain its original metabolic rate, resulting in vitamin C deficiency and scurvy. Therefore, when stopping the drug, the dose should be gradually reduced.

Allergic reactions: Some people will have allergic reactions, mainly manifested as rash, nausea and vomiting, and in severe cases, anaphylactic shock can occur, which cannot be abused.