Vitamin D has the following physiological functions:
1、
Improve the body's absorption of calcium and phosphorus, and make the plasma calcium and phosphorus levels reach saturation.
2、
Promote growth and bone calcification, and promote dental health;
3、
Increase the absorption of phosphorus through intestinal wall and increase the reabsorption of phosphorus through renal tubules;
4、
Maintain the normal level of citrate in blood;
5、
Prevent the loss of amino acids through the kidneys.
Second, the effects of vitamin D excess and deficiency on health
Lack of vitamin D can cause rickets, hand and foot convulsions and rickets.
Long-term excessive intake of vitamin D(5000IU) will cause hypercalcemia and hypercalcemia. It is characterized by anorexia, excessive thirst, nausea, vomiting, irritability, weakness and diarrhea. In severe cases, it will die due to calcification of kidney, heart and aorta.
Third, people who need vitamin supplements.
1. People living in cities, especially those living in areas polluted by heavy smoke, should take more vitamin D;
2. People who work at night, nuns, or people who can't get enough sunshine because of clothes, lifestyles, etc., should pay special attention to increasing the intake of vitamin D in their diet;
3. If you are taking antispasmodic drugs, you must increase the intake of vitamin D;
4. Children who drink milk without vitamin D must increase their intake of vitamin D;
People with darker skin and living in the northern climate zone need more vitamin D.