Vitamin A
It is absorbed with dietary fat, reach blood stream via lymphatic system
Function:
It is important for:
1- normal vision
2- the immune system
3-reproduction
4- helps the heart, lungs, kidney and other organs work properly
5-treating type 2 diabetes
6-delayed growth in children
vitamin A it contribute to the production of sebum, the oil that helps maiming levels if moisture in the skin and hair
8-Lowering cancer risk
-Adequate intakes of carotenoids from fruits and vegetables are associated with a lower risk of lung cancer, but the use of bete-carotene and vitamin supplements have not shown the same results
(one meta -analysis suggests that some forms of vitamin A )
-help protect agents prostate cancer.
(studies in Japan have suggested that beta-carotene may)
-help prevent colon cancer.
Types:
the first type : (preformed vitamin A) found in meat poultry, fish, and dairy products
The second type : ( provitamin A) found in fruits vegetables and other plant-based products
the most common type is provitamin A in food and dietary supplements is beta-carotene
Daily value (DV)
For adults and children age 4 years and older (5000 IU) from a varied diet of both plant and animal foods
Sources:
1-some types of fish, such as salmon
2- green leafy vegetables and other green, orange, and yellow vegetables such as broccoli carrots and squash
3-fruits including cantaloupe, apricots, and mangos
4- diary products is a major sources of vitamin A for Americans
5-fortified breakfast cereal
Vitamin A deficiency:
The most common symptoms in young children and pregnant women is eye condition called ( xerophthalmia)
1-Xerophthalmia : is the inability to see in low light, and it can lead to blindness if it isn't treated
2-decrease immune function
3-increase morbidity
Vitamin A toxicity:
Preformed vitamin A causes....
1-dizziness
2-nausea
3-headaches
4-come
5-death
In pregnant women causes
6-birth defects in their babies
Provitamin A ( beta-carotene) causes ......
1- skin yellow-orange
But this condition is harmless and don't cause birth defects
Written by
Written by
Dr : Hassan Ahmed mostafa
DR : shaimaa Ahmed Abo elyazied
Under the patronge of owner
Ahmed Said
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