VITAMIN  A

NUTRIENTS

HEALTH  SCIENCE

VITAMIN A

ROLE IN BODY

DEFICIENCY

SOURCES

DOSAGE

TOXICITY

Vitamin A is the group of fat-soluble nutrient compounds including retinol, retinal, and retinyl esters that are found in animals as well as plants

ROLE OR FUNCTION OF VITAMIN A

It’s play important role in vision:

Retinal, the active form of vitamin A, combines with the protein opsin to form rhodopsin, a molecule necessary for color vision and low-light vision that helps protect and maintain the cornea

1

Immunity function

It supports immune function by supporting the growth and distribution of T-cells, a type of white blood cell that protects your body from infection.

2

Supporting the cell growth:

It helps to maintain healthy skin and the surface tissues such as your skin, intestines, lungs, bladder, and inner ear.

3

Reproduction and fetal development

It play important role in reproduction such as the development of sperms and ovaries. It helps fetal tissue development and maintenance, as well as fetal growth.

4

DEFICIENCY OF VITAMIN A

BLINDNESS

The deficiency may creates the blindness problem because lack of rhodopsin, a molecule necessary for color vision and low-light vision.

Increased infection risk

The deficiency of this causes lower development of T-cell, which play a central role in immune responses that guard against disease.

Increase the risk of measles, diarrhea, and Anemia

deficiency of this increases the severity and risk of dying from infections like measles and diarrhea. Also, raise the risk of Anemia.

Skin issues

low level of this vitamin create skin issues like hyperkeratosis and acne

Pregnant complications

The deficiency of this vitamin raises the risk of death in pregnant women and negatively impacts the fetus by slowing growth and development.

source of vitamin a

rda value of  vitamin a

The recommended dietary allowance (RDA) for vitamin A is 900 mcg and 700 mcg per day for men and women respectively.

TOXICITY

Chronic toxicity occurs when doses more than 10 times the RDA are ingested over a longer period.

OVERDOSE SIDE  EFFECTS

– Vision disturbances – Joint and bone pain – Poor appetite – Nausea and vomiting – Sunlight sensitivity – Hair loss – Headache – Dry skin – Liver damage – Jaundice – Delayed growth – Decreased appetite – Confusion – Itchy skin