What do vitamins A and D do?

Types of vitamins A D E play a very important role in health, especially the development of young children. So what are the effects of vitamins A and D, what is the dose, if too much vitamin A D E is used, will it cause any harm?

To find out what vitamin A and D do, let's first find out which foods are these two vitamins commonly found in? Specifically:
Foods high in vitamin A: Animal meat and liver, butter, eggs, milk are rich sources of vitamin A. In addition, some red and yellow vegetables also contain a lot of beta carotene, which is a vitamin A precursor. Compared with animals, vitamin A supplements from plants help limit the risk of overdose. Foods rich in vitamin D: Vitamin D has two forms, vitamin D2 and vitamin D3, in which, D2 is abundant in some fungi and yeasts, and D3 is abundant in the liver of some fish such as shark, mackerel and mackerel. , ... Therefore, fish oil is a commonly used food to supplement vitamin A D E, in addition to vitamin K.

Answer to the question what do vitamins A and D do? The answer is given as follows:
Vitamin A: In the body, vitamin A participates in the process of creating tissues, skin and retina. Therefore, vitamin A plays an important role in vision, and also helps the body strengthen the immune system, resistance to infectious factors. In young children, vitamin A deficiency will cause night blindness, dry eyes, respiratory infections, affect the general development of children, slow growth, anorexia, ... Vitamin D: In the body Vitamin D participates in bone formation by metabolizing calcium and phosphorus. In young children, vitamin D deficiency leads to rickets. In adults, vitamin D deficiency can cause osteoporosis. Reference: Effects of vitamin D deficiency in adults

To avoid overdose, each subject needs to use the following dose of vitamin A D E:
Children: Children should be provided with 2,500 IU of vitamin A and 400 IU of vitamin D each day. Adults: Each Adults need to provide the body with no more than 5000 IU of vitamin A per day and equal to 400 IU of vitamin D for children. To avoid overdose of vitamin A D E, it is necessary to stop taking 1 to 2 weeks after use. Use continuously for 3 weeks.
Reference: How to determine the right dose of vitamin D for children?

A poor diet will affect the development and health of young children. Vitamin A D E deficiency will make the body's resistance weak, children often suffer from respiratory and digestive infections, anorexia, growth retardation, rickets.
Therefore, many vitamin A supplementation programs are implemented on a large scale to help children get the required amount of vitamin A. Besides, today, many parents choose foods such as fish oil to supplement vitamin A D E for their children. However, if not careful, the abuse or overdose of vitamins A and D can cause many serious harms. Eg:

Excess vitamin D in pregnant women can cause placental calcification. Excess vitamin A can cause irritability, hair loss, dry skin, itching and congestion, fontanelles due to increased intracranial pressure in children under 12 months of age. Excess vitamin A D E in children causes fatigue, loss of appetite, vomiting, growth retardation due to early ossification of cartilage. In adults, hypertension, muscle weakness, increased blood calcium levels, leading to calcium kidney stones, calcifications in the heart, kidneys and bones.

To avoid causing unnecessary side effects mentioned above, when supplementing with vitamin A D E should be noted:
Do not arbitrarily give high doses of vitamin D supplements to children without a doctor's prescription. Only used for children with convulsions due to calcium deficiency, rickets due to vitamin D deficiency, and have been examined by a doctor and advised on appropriate dosage because this is a long-acting medicine. In adults with hypercalcemia, hypercalciuria, calcium kidney stones absolutely should not use high doses of vitamin D. Feed children a variety of foods containing fats from vegetable oils or animal fats according to the nutritional pyramid, and supplement vitamin A D E after for good absorption. If the child has been supplemented with vitamin A at the local health facility according to the program, the child should not be given vitamin A. Among the vitamins A D E, vitamins A and D play a very important role in health. and development, especially in young children. Vitamin A helps protect vision health and vitamin D participates in the process of bone formation, making bones strong. Therefore, parents need to supplement their children with the right dosage, avoiding excess or insufficient use of both affecting the health of the child.