Vitamin A is a well known fat soluble vitamin found in many
supplements and foods. Vitamin A actually is a group of antioxidant
compounds that play an important role in vision, bone growth and health
of the immune system.
The vitamin exists in three
major forms: retinal (the aldehyde isoform), retinol (the
alcohol isoform), and retinoic acid (RA), which is the
irreversibly oxidized form of retinol . As it relates to eyesight,
vitamin A (also called all-trans-retinol) has been shown to be useful in
helping with night vision.
Vitamin A is a precursor
of rhodopsin, the photopigment found in rods within the retina of human
eye that helps them to see at night. Without vitamin A, "night
blindness" occurs.
Vitamin A is found in a variety of
natural foods and the bioavailability of carotene in food is variable
because the efficacy of metabolic processes that convert carotene
into retinol varies from one person to another.
What does the term "diet" mean? The definition of a diet as the complete oral consumption of nutrients and non-nutritive substances is comprehensive yet lacks specificity. It is defined by the typical composition and allocation of nutrients and foods ingested by an individual or a specified group.
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