Vitamins are a group of substances needed in small amounts by the body to maintain health.
Vitamin A cannot be made by the human body and so it is an essential part of the diet. Vitamin A is important for healthy eyes, good eyesight visionhealthy skin and to help you fight infections. Vitamin A is sometimes also called retinol.
Foods that contain vitamin A include liver, milk, eggs and fish-liver oils. Mild forms of vitamin A deficiency can usually be treated without any long-term problems. Vitamin A deficiency is much more common in low-income countries, where it is often very severe and can cause loss of vision and even death.
Deficiency, or a lack, of vitamin A in your body happens because of a lack of sufficient amounts of vitamin A in your diet. Over time, a lack of vitamin A means that you may essay about vitamin a peer review problems with vision and be less able to fight infections. Mild forms of vitamin A deficiency may cause no symptoms. However, vitamin A deficiency may cause tiredness fatigue. Vitamin A deficiency may be caused by prolonged inadequate intake of vitamin A.
This is especially so when rice is the main food in your diet rice doesn't contain any carotene.
Vitamin A deficiency may also occur when your body is unable to make use of the vitamin A in your diet. This may occur in a variety of illnesses, including:. If your doctor w you may have vitamin A deficiency then you will need to have blood tests to:. Other investigations will include tests of vision, especially how your vision adapts to the dark.
How much vitamin A does a child need?
In children, X-rays of the long bones may be useful to assess bone growth, which may be delayed in vitamin A deficiency. The treatment for mild forms of vitamin A deficiency includes eating vitamin A-rich foods - eg, liver, beef, oily essay about vitamin a peer review, chicken, eggs, fortified milk, carrots, mangoes, sweet potatoes and leafy green vegetables.
For more severe forms of vitamin A deficiency causing symptoms, treatment includes taking daily oral vitamin Writing a college essay in apa format supplements. Find a range of services to suit you, from essay about vitamin a peer review through to managed programs. Vitamin A deficiency is unusual in peeg income countries.
However, it is very common in low income countries where it often develops because of intestinal infections and worms, and protein-energy malnutrition. Vitamin A deficiency is the biggest cause of preventable blindness in children worldwide. It is the most common nutritional deficiency in the world.
Explore Other Vitamins and Minerals
The most easily absorbed form of vitamin A is fat-soluble, and is absorbed as fat is broken down in the small bowel, so people who are on an extremely low-fat diet or are taking medication to reduce fat absorption, such as orlistatmay be at risk of vitamin A deficiency.
The outcome is very good if you have a mild form of vitamin A deficiency without any symptoms. However, more severe forms may cause permanent loss of essay about vitamin a peer review if treatment with vitamin A supplements is not taken writing an argument essay example with apa format an early stage.
If you have early mild eye problems, treatment can result in full recovery without any permanent loss of vision. Severe vitamin A deficiency with severe generalised malnutrition in low income countries often leads to death. Most vitamins, including vitamin A, cannot be made by the human body and so they are an essential part of your diet.
A regular intake of vitamin A-rich foods will usually prevent vitamin A deficiency as long as you do not have any long-term condition preventing your body from using the vitamin A in your diet. Liver, beef, chicken, oily fish, essay about vitamin a peer review, whole milk, fortified milk, carrots, mangoes, orange fruits, sweet potatoes, essay about vitamin a peer review, kale and other green vegetables are among foods rich in vitamin A. Various foods, such as breakfast cereals, pastries, breads, crackers and cereal grain bars, are often fortified with vitamin A.
For people at increased risk, especially young children, vitamin A supplements can reduce the risk of symptoms, permanent loss of vision, and the risk of dying.
There are two main groups of sources of vitamin A.]