15 Health Benefits and Side Effects of Vitamin A - For Better Eye Sight

Table of Content
About Vitamin A
Health Benefits of Vitamin A
  • Treatment of Eye Problems
  • For Healthy Bone and Teeth
  • For Healthy Growth and Reproduction
  • Prevention of Cancer
  • Boosts the Immune System
  • Prevents Urinary Stones
  • Repairs the Body Tissues
  • Treatment of Acne
More Health Benefits of vitamin A
27 Rich Sources of Vitamin A
Deficiency Symptoms of Vitamin A
Skin Benefits of Vitamin A
Precautions

About vitamin A
Vitamin A is the first recognized fat soluble vitamin and it is an essential nutrient for growth and survival. It acts as a powerful antioxidant in the body. Vitamin A is the term used to refer to the entire group of retinoid. Carotene which is a pro-vitamin, is a yellow pigment present in fruits and vegetable foods. It is converted into vitamin A in the body to be utilized. Retinol which is an active form of vitamin A does not need to be converted before it can be utilized by the body, it is known as the main vitamin A. Retinol is found in the foods of animals like meat, chicken, fish and liver while carotene is provided by the foods of fruits, vegetables and some animal products.
Vitamin A is the first recognized fat soluble vitamin and it is an essential nutrient for growth and survival. It acts as a powerful antioxidant in the body. Vitamin A is the term used to refer to the entire group of retinoid. Carotene which is a pro-vitamin, is a yellow pigment present in fruits and vegetable foods. It is converted into vitamin A in the body to be utilized. Retinol which is an active form of vitamin A does not need to be converted before it can be utilized by the body, it is known as the main vitamin A. Retinol is found in the foods of animals like meat, chicken, fish and liver while carotene is provided by the foods of fruits, vegetables and some animal products.

London medical papyrus showed that juice extracted from cooked liver is capable of healing night blindness, which is the first recognized nutritional deficiency disease. Vitamin A is needed by the retina of the eye in form of retinal (also known as rhodopsin or retinaldehyde). In concentrated form, retinal is light yellow in color, gives a mild pleasant odor and solidifies when cooled, it is the key molecule involved in vision. Retinal is soluble in most organic solvent but insoluble in water or glycerol.
About 80% of vitamin A is absorbed in the human system. It passes through the lymphatic system with fat into the bloodstream.

The absorption of vitamin A is more rapid in men than in women but increases when taken with fats. The absorption of this vitamin is poor in the cases of diarrhea, jaundice and abdominal disorders. Vitamin A is stored in the liver, an average liver weighing 1,500g can store up to 145500mcg of vitamin A in a healthy person. Approximately 20% of this vitamin is not absorbed by the body and it's excreted within one to two days in faeces or urine, while others are stored. Palmate is another form of vitamin A, it is normally taken in the form of capsule.


Health Benefits of Vitamin A
About Vitamin A  Health Benefits of Vitamin A  Treatment of Eye Problems For Healthy Bone and Teeth For Healthy Growth and Reproduction Prevention of Cancer It Boost the Immune System Prevents Urinary Stones Repairs the Body Tissues Treatment of Acne More Health Benefits of vitamin A  Rich Sources of Vitamin A  Deficiency Symptoms of Vitamin A  Skin Benefits of Vitamin A  Precautions

Vitamin A provides the required stimulation for vision in the retina. It is also required for growth, reproduction and maintenance of life. Vitamin A keeps the mucous linings and membranes of the eyes, lungs, stomach and intestines in a healthy condition. It provides resistance to respiratory infections and prevents eye disease. It aids in the secretion of the gastric juices and digestion of protein. Vitamin A plays an important role in prevention and treatment of skin ailments and promotion of healthy hair, teeth, gums and vision. It also increases the permeability of the blood capillaries, hence, helps in tissue oxygenation. This vitamin is beneficial in the prevention of premature aging, senility, and it extends youthfulness. Vitamin A is valued in treating common cold, sinus problems, influenza, and other infectious diseases as well as asthma, kidney disorders, high blood pressure and arthritis.

Treatment of Eye Problems
Night blindness and corneal damage can be treated by sufficient intake of vitamin A. High doses of vitamin A is used for reducing the incidence of vitamin A deficiency especially in small children. About 60000mcg of retinal can be administered orally to children with the case of xerophthalmia (a type of dry conjunctivitis due to lack of vitamin A) in single doses for beneficial results. The ability of vitamin A to promote vision is because of the rhodopsin molecules that is active when light shines on the retina. Carotene is also valued in preventing muscular degeneration (age-related eye disease).

For Healthy Bone and Teeth
Although calcium, protein and vitamin D is known to build strong and healthy bone and teeth, vitamin A is also very effective for strong and healthy teeth. It helps in the formation of a solid layer called dentin, which strengthens the teeth. Recent studies suggest that vitamin A may also reduce the risk of fractures.

For Healthy Growth and Reproduction
As mentioned earlier, vitamin A is essential for the maintenance of growth, reproduction and life. Studies have shown that deficiency of this vitamin in women can lead to poor development of embryos during pregnancy, therefore, may cause birth defects. In men, It may lead to poor development of sperm cells, thereby leading to infertility. Pregnant women with vitamin A deficiency have higher risk of mother to child HIV.




Prevention of Cancer
Vitamin A is a powerful antioxidant that is valued in preventing some certain forms of cancer. The development of abnormal cells is one of the causes of cancer and vitamin A (carotene) helps in growth and development of cells, hence, reduces the risk of cancers like lung and cervical cancer.


Boosts the Immune System
Vitamin A plays an important role in the maintenance of the body immune system by promoting the activity of the lymphotic responses against disease causing antigens. White blood cells helps to fight infections such as diarrhea and malaria.

Prevents Urinary Stones
Urinary Stones is formed in the kidney, vitamin A helps to prevent the formation of urinary calculi by forming calcium phosphate in the body.

Repairs the Body Tissues
Vitamin A is very beneficial in the replacement of worn out tissues by building up new ones. The deficiency of necessary nutrients needed for the production of tissues may lead to poor development of new tissues in the body.

Treatment of Acne
Famous nutritionist Adele Davis, says that she has seen many severe cases of acne clear up when an adequate amount of vitamin A is taken. Vitamin A deficiency may increase the risk of developing acne because there will poor clearing up of dead skin cells. It also prevent acne by reducing excess production of sebum.


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More Health Benefits of Vitamin A
  • It helps reduce the body cholesterol levels.
  • Beta-carotene is a powerful antioxidant that helps to relieve inflammations.
  • Retinol plays a role in the formation of visual purple in the eyes to ensure healthy retina.
  • Vitamin A reduces the risk of cataracts.
  • It relieves fever and diarrhea caused by measles.
  • It is beneficial to people who have glaucoma.
  • It helps in muscle growth.


27 Rich Sources of Vitamin A
Source
mcg
Soya beans
426
Lentil
270
Colocasia leaves
12000
Turnip greens
9396                 
Drumstick leaves
6780
Betel leaves
5760
Carrot leaves
5700
Spinach
5580
Radich leaves
5295
Celery leaves
3990
Carrots
1890
Lettuce
990
Onion stalks
595
Ripe Mangoes
2743
Persimmon
2267
Fresh Apricots
2161
Passion Fruit Juice
1967
Cape goose berries
1428
Oranges
1104
Ripe Tomatoes
351
Ripe Papayas
666
Jack Fruit
175
Melon
168
Beef Liver
6690
Egg Yolks
420
Cow Milk
420
Butter
960

Deficiency Symptoms of Vitamin A
Prolonged deficiency of this vitamin may result to inflammation of the eyes, poor vision, poor eye health and night blindness. Vitamin A deficiency may also lead to loss of appetite, vigor, defective teeth and gums, muscular degeneration, weak finger nails, low level of vitamin D, respiratory infections, chronic gut and certain skin disorders such as pimples, premature aging, acne, boils, wrinkles, pores, dark spots and blemishes.


Skin Benefits of Vitamin A
Vitamin A is very essential for proper maintenance of the skin, it helps to soften the skin texture by keeping it moist. It eliminates wrinkles, age spots and reduces the signs of aging. Beta-carotene is an antioxidant that gives youthful skin while retinol is important in eliminating dead skin cells. It is believed that vitamin A helps to relieve warts, boils, rashes and carbuncles.

Vitamin A is very essential for proper maintenance of the skin, it helps to soften the skin texture by keeping it moist. It eliminates wrinkles, age spots and reduces the signs of aging. Beta-carotene is an antioxidant that gives youthful skin while retinol is important in eliminating dead skin cells. It is believed that vitamin A helps to relieve warts, boils, rashes and carbuncles.

Precautions: The intake of high doses of vitamin A may cause toxic effects in adults and children. The toxic effects in adults includes hair loss, nausea, vomiting, diarrhea, scaly skin, blurred vision, pain in the bone, mild fever, excessive Sweating, mental discomfort, Irregular menstruation, irritability and fatigue. The toxic effects in children may include abdominal pain, nausea, vomiting, headache, dizziness, sluggishness, sleepiness, loss of consciousness, peeling of skin and also an increased risk of pneumonia.

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