Eat Stop Eat

Best Weight Loss Programs That Work

Get Instant Access

Fig. 4.6 Some important metabolic transformations of vitamin A. The parent compound of the vitamin A group is all-frans-retinol (A). It can be obtained directly from the diet or formed from the breakdown of dietary P-carotene (provitamin A) from plants (B). The active form of vitamin A in the visual process is 11-cis-retinal (C). Retinyl esters (mainly palmitate) provide a storage form of the vitamin in tissues, especially the visual pigment at the back of the eye (D). All-frans-retinal can be converted into retinoic acid (E), which has no visual function, but is involved in processes of cellular differentiation. Vitamin A can be excreted via the formation of glucuronides from retinoic acid or from vitamin A itself. Reactions 1-10 are described in further detail in the text.

Was this article helpful?

0 0
Weight Loss All Star

Weight Loss All Star

Are you looking to lose weight or even just tone up? What is stopping you from having the body you want and help you feel great at the same time? I created Weight Loss All-Star for all those wanting to lose weight, and keep the weight off. I know how hard it is to do diets and stick with them, and get the motivation to get up and exercise.

Get My Free Ebook

Post a comment