| Vitamin A: Daily Need |
| Infants, birth to 6 months | 400 mcg |
| Infants, 7 to 12 months | 500 mcg |
| Children, 1 to 3 years | 300 mcg |
| Children, 4 to 8 years | 400 mcg |
| Children, 9 to 13 years | 600 mcg |
| Boys, 14 to 18 years | 900 mcg |
| Girls, 14 to 18 years | 700 mcg |
| Men, 19 years and older | 900 mcg |
| Women, 19 years and older | 700 mcg |
| Pregnant women, 14 to 18 years | 750 mcg |
| Pregnant women, 19 years and older | 770 mcg |
| Breastfeeding women, 14 to 18 years | 1,200 mcg |
| Breastfeeding women, 19 years and older | 1,300 mcg |
| mcg means Micrograms |
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Vitamin A, also known as Retinol, is a fat-soluble vitamin that has considerable important functions in human body.
| Vitamin A: History |
| References to Vitamin A deficiency and its treatment can be found in many places throughout history. However, in 1913, scientists announced it as a fat-soluble vitamin. It is a nutrient essential for growth and survival. Two groups of scientists were researching it that year. At the University of Wisconsin, E. V. McCullum and Marguerite Davies were one group and a group of T. B. Osborne and L. B. Mandel were working in Yale University. They separately demonstrated that a component of butter was essential for the physiological growth of rats. In 1930 T. Moore, a scientist, made an important discovery. A pigment called carotene is present in carrots and some other fruits. Vitamin A was found in their livers when given to mice deficient in vitamin A. Carotene is a yellow substance found in vegetables. It is converted into vitamin A in the body. |
| Vitamin A: Functions in Body |
|
| Sources of Carotene |
| . Carotene is a fat-soluble precursor of vitamin A that exists in green and yellow vegetables. A small portion of carotene is absorbed from the intestines and contributes to the yellow serum color. The major sources of Carotene are:
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| Vitamin A: Deficiency Symptoms |
| . Prolonged lack of vitamin A causes:.
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| Precautions |
| . 30,000 mcg daily intake of Vitamin A for a few months shows the toxic effects of vitamin A. Avoid giving 5550 mcg daily intake of Vitamin A to infants. Symptoms of toxic effects are: Hair loss, nausea, vomiting, diarrhea, scaly skin, blurred vision, bone pain, irregular periods, fatigue, headache, liver swelling. If a large dose is taken at once, symptoms such as stomach cramps, nausea, vomiting, dizziness, fatigue etc. are seen. 12000 daily intake of Vitamin A several may cause symptoms such as leg pain, joint pain, hair loss, chapped lips, anal fissures, loss of appetite, fever and weight loss. |
also read:
| VITAMIN C |
| FOOD GROUPS |
| FOOD & NUTRITION |
| HAPPY HORMONES IN BODY |
| POSITIVE THINKING |
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