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How Vitamin A affects our vision?

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Vitamin A is a fat-soluble vitamin that is essential for various physiological functions in the body. It exists in several forms, including retinol, retinal, and retinoic acid, which collectively are known as retinoids. Additionally, provitamin A carotenoids, such as beta-carotene, can be converted into active vitamin A in the body.


Key functions of vitamin A include:
  1. Vision: Vitamin A is crucial for maintaining healthy eyes and vision. Retinal, one of the forms of vitamin A, is a component of the light-sensitive pigments in the retina of the eye. It plays a key role in the process of converting light into nerve signals that are sent to the brain.
  2. Immune System Support: Vitamin A is important for the proper functioning of the immune system. It plays a role in the development and maintenance of the skin and mucous membranes, which act as barriers against infections.
  3. Cell Growth and Differentiation: Vitamin A is involved in the regulation of cell growth, differentiation, and gene expression. It is essential for the normal development of tissues and organs.
  4. Reproduction: Vitamin A is necessary for normal reproductive processes, including embryonic development and fetal growth.
  5. Skin Health: Vitamin A contributes to the health of the skin by promoting cell turnover and supporting the production of skin cells.
Good dietary sources of vitamin A include:
  • Animal sources: Liver, fish liver oil, eggs, and dairy products (such as milk and cheese)
  • Plant sources: Beta-carotene, a provitamin A carotenoid, is found in colorful fruits and vegetables, particularly those that are orange or yellow. Examples include carrots, sweet potatoes, pumpkins, mangoes, and spinach.
Vitamin A deficiency can lead to various health issues, including night blindness, increased susceptibility to infections, and impaired growth. On the other hand, excessive intake of vitamin A from supplements can lead to toxicity, which can cause symptoms such as nausea, dizziness, and, in severe cases, more serious health issues.

It's important to maintain a balanced diet that includes an adequate amount of vitamin A, and if considering supplementation, it should be done under the guidance of a healthcare professional to avoid potential risks of excess intake.

-- Written by Hala, founder of Dietapplements

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