Vitamin A And Reproductive System
Home of Kyle J. Norton for The Better of Living & Living Health Vitamin A also known as Vitamin A Retinol, is a yellow, fat-soluble substance, and essential for growth and life and producing pigments in the eye's retina for scotopic vision (low-light vision). The vital vitamin come from 2 types of foods
1. Retinol, one of the animal forms of vitamin A, is a yellow, fat-soluble substance, a diterpenoid and an alcohol converted to vitamin A and and the retinyl ester derivative of the alcohol stored mostly in liver, when eating animal food sources, such as liver and egg yolk. When converted to retinoic acid, vitamin A is essential for skin health, teeth remineralization, bone growth.and the process of cell differentiation, hence, the growth and development of embryos Retinoic acid via the retinoic acid receptor.
2. Carotenes, including alpha-carotene, beta-carotene, gamma-carotene, and
xanthophyl beta- cryptoxanthin, possess the enzyme required to convert these compounds to retinal. Carotenes are the group of orange pigments phytochemical belonging to the class of
Carotenoids (tetraterpenoids), found abundantly in carrots, pumpkins, maize,
tangerine, orange, in dark, leafy greens and red, orange and yellow fruits and vegetables, etc.
and contained many health benefits(1)
Vitamin A and Reproductive System
a. In the study to investigate two groups of 100 white leghorn hens were fed rations either supplemented or deficient in vitamin A for 32 weeks, showed that the ovaries of vitamin A-deficient chickens had increased numbers of atretic follicles compared with the ovaries of vitamin A-supplemented hens (20, 24, 28, and 32 weeks), and these atretic follicles contained moderate to severe hemorrhage. Hemorrhage was located either uniformly throughout the follicle or more commonly between the detached granulosa cell layer and the theca interna. Hemorrhagic follicles were uncommon in both vitamin A-supplemented hens and low-production vitamin A-supplemented hens(38)
b. Recent evidence describes how the enzymes which control vitamin A metabolism in the testis could be targeted to generate effective male contraceptives; however, the detailed mechanism(s) regarding how vitamin A regulates normal spermatogenesis are still unknown(39)
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Sources
(1) http://medicaladvisorjournals.blogspot.ca/2012/02/phytochemicals-in-foods-11-health_22.html
(38) http://www.ncbi.nlm.nih.gov/pubmed/8363493
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