About Vitamin A Deficiency

Vitamin A deficiency exists when the chronic failure to eat sufficient amounts of vitamin A or beta-carotene results in levels of blood-serum vitamin A that are below a defined range. Beta-carotene is a form of pre-vitamin A, which is readily converted to vitamin A in the body. Night blindness is the first symptom of vitamin A deficiency. Prolonged and severe vitamin A deficiency can produce total and irreversible blindness. Abnormal visual adaptation to darkness, dry skin, dry hair, broken fingernails, and decreased resistance to infections are among the first signs of vitamin A deficiency

multivitamin for men reviewBecause vitamin A is an important component for normal vision, vitamin A deficiency will cause night-blindness, or a decreased ability to see in dim light. Another symptom of vitamin A deficiency is diminished immune system function, which means your body will have difficulty fighting infections.

Vitamin A deficiency  is more likely to result from inflammatory diseases that damage the digestive tract and prevent absorption of vitamin A, such as Crohn’s disease and celiac disease. Alcoholism, zinc deficiency and pancreatic diseases can also affect the amount of vitamin A in the body.

Vitamin A is actually a group of natural compounds that your body needs for clear vision, healthy bones and skin, normal cell division and differentiation, and reproduction. Vitamin A also helps your body’s immune system fight off infections.

The recommended dietary allowance (RDA) for vitamin A is 1.0 mg/day for the adult man and 0.8 mg/day for the adult woman. Since beta-carotene is converted to vitamin A in the body, the body’s requirement for vitamin A can be supplied entirely by beta-carotene. Six mg of beta-carotene are considered to be the equivalent of 1 mg of vitamin A. The best sources of vitamin A are eggs, milk, butter, liver, and fish, such as herring, sardines, and tuna. Beef is a poor source of vitamin A. Plants do not contain vitamin A, but they do contain beta-carotene and other carotenoids. The best sources of beta-carotene are dark-green, orange, and yellow vegetables; spinach, carrots, oranges, and sweet potatoes are excellent examples. Cereals are poor sources of beta-carotene.

Vitamin A is used for two functions in the body. Used in the eye, it is a component of the eye’s light-sensitive parts, containing rods and cones, that allow for night-vision or for seeing in dim-light circumstances. Vitamin A (retinol) occurs in the rods. Another form of Vitamin A, retinoic acid, is used in the body for regulating the development of various tissues, such as the cells of the skin, and the lining of the lungs and intestines. Vitamin A is important during embryological development, since, without vitamin A, the fertilized egg cannot develop into a fetus.

There are necessarily three Forms of vitamin A. One is retinols which is the most active form and found in source of animal food. Other  form  Beta carotene known as  provitamin  a and found in the plant source of retinol from which mammals gain two-thirds of their vitamin a. Carotenoids is the largest group among the three and exist in a free alcohol.

In the human body retinol is the powerful form. Retinol- binding protein regulates the absorption and metabolism of vitamin A and helps to bind vitamin a. Vitamin a is essential For the growth of bone, for vision,especially in dark adaption,reproduction,cell growth and repair,urinary,for the maintenance of the eyes surface lines, immune response and intestinal tracts. Vitamin A is also vital for the regulation of adult genes.

Primarily the vitamin A deficiency happened when people eat the rice which has not contain the carotene. And this is also occurred when protein –energy is absent in daily food.

Secondarily  for the deficiency of vitamin A  the celiac disease, cirrhosis , giardiasis ,tropical  sprue, cystic fibrosis and other pancreatic disease is occurred.

Vitamin A deficiency occurs with the chronic consumption of diets that are deficient in both vitamin A and beta-carotene. When vitamin A deficiency exists in the developed world, it tends to happen in alcoholics or in people with diseases that affect the intestine’s ability to absorb fat. Examples of such diseases are celiac disease (chronic nutritional disorder), cystic fibrosis, and cholestasis (bile-flow failure or interference).

Other problems are happened for the vitamin A deficiency is: inflammatory bowel disease ; fat malabsorption; pancreatic insufficiency; vegan diet; alcoholism; following small-bowel bypass surgery.

If you have vitamin A deficiency symptoms, you need to see a health care provider who can order blood tests to determine if a vitamin A deficiency is the problem or if there are other causes. Vitamin A status is measured by tests for retinol. Blood-serum retinol concentrations of 30-60 mg/dl are considered in the normal range. Levels that fall below this range indicate vitamin A deficiency. Night blindness is measured by a technique called electroretinography. Xerophthalamia, keratinomalacia, and Bitot’s spots are diagnosed visually by trained medical personnel.

The prognosis for correcting night blindness is excellent. Xerophthalamia can be corrected with vitamin A therapy.

Vitamin A deficiency can be prevented by including foods rich in vitamin A or beta-carotene as a regular component of the diet; liver, meat, eggs, milk, and dairy products are examples. Foods rich in beta-carotene include red peppers, carrots, pumpkins, as well as those just mentioned. Margarine is rich in beta-carotene, because this chemical is used as a coloring agent in margarine production.

Unfortunately, not all of us meet our daily requirements due to inadequate diets or as a result of a medical condition. Either way, a Multivitamin for Men supplement is important to match up to what your body needs to function properly.

A daily Multivitamin for Men supplementation provides the required consumption of many micronutrients that may not be enough in our diet and help to prevent from vitamin A deficiency.

Vitamin A is important for your eyesight

Vitamin A is commonly known as the vitamin needed for good eyesight.   A vitamin A deficiency primarily causes impaired vision and increases susceptibility to infectious diseases.

multivitamin for men reviewWhen we look at objects, light is reflected from the object and enters the eye, striking a tissue located in the back of the eye. This tissue is known as the retina. When light strikes the retina, retinol is converted to retinal, which is then shuttled to rods – the cells that help you to see in the dark. In rod cells, retinal binds to a protein called opsin. As a result, opsin changes shape and causes nerve impulses to be generated. These nerve impulses then carry messages to the brain regarding the objects in our visual field. Retinal is then converted back to retinol, ending the visual cycle.

A hallmark of vitamin A deficiency is night blindness – an impaired ability to see in low light conditions. This is because with a reduced availability of retinol, the nerve impulses necessary for our brain to interpret visual information are hindered.

The benefits of Vitamin A are good for your eyes and eyesight   in 3 major ways: helps prevent night blindness, prevents cataracts (like Vitamin C) and helps to preserve eyesight. Let’s go over how Vitamin A & beta carotene benefits each one…

For Night Blindness… your retinas are light-sensitive cells that have a large amount of Vitamin A stored in it. And within your retinas you have a thing called rods and cones. Rods and cones allow you to see black & white and colors, respectively. The rods are specifically used for night vision.

Without getting too scientific, rods use the combination of a special protein called opsin and a specific form of Vitamin A (called retinal) in order to function properly. Without the Vitamin A portion… the rods would not work properly and you won’t be able to see that well in dark or in dim lighting. This is especially true as you get older.

The next one is about Cataracts. Cataracts form when the lens of the eye becomes cloudy… making it very difficult to see. Cataracts used to be one of the leading causes of blindness.

But a better way to prevent this from happening (and avoiding the surgery to fix it) is having a diet rich in carotenoids… especially beta carotene.

The antioxidant power of beta carotene wipes out the free radicals before they damage the lens.

Vitamin C is also helpful in preventing cataracts. So combining these 2 will definitely help to prevent cataracts.

And lastly is helping to preserve your eyesight. As you grow older there is a thing called Age-Related Macular Degeneration (AMD) which causes some vision loss. AMD is one of the leading causes of blindness in people older than 65. And about 31% of Americans 75 and older has it.

One study suggests that eating just one serving of a food high in Vitamin A or beta carotene can reduce the chances of AMD by almost half! A few other carotenoids (i.e. Lutein and zeaxanthin) are also helpful in preserving your eyesight as you get older.

So if you like your eyes and want to keep your eyesight healthy for a long time… it’s best to take Multivitamin for men. It includes Vitamin A and beta carotene and all you need.