Vitamin A Flashcards
What are some excellent sources of Vitamin A
Beef liver, herring, milk, margarine, sardines, egg, cheese, tuna
What is the DV for vitamin A
225ugs
What are some sources of carotenoids
carrots, watermelon, papays, tomatoes, squash, grapefruit, pumpkins
What are the forms of retinoid
retinol, retinal, retinoic acid, retinyl ester
what are the forms of carotenoids
beta-carotene, alpha carotene, beta-cryptoxanthin
what are some vitamin A precrursurs
lycopene, oxycarotenoid, canthaxanthin, lutein, zeaxanthin
How effective is synthesis of retinoid from beta carotene
50%
Where is vitamin A absorbed
duodenum and jejunum
What regulates the uptake of vitamin A
intestine-specific homeobox transcription factor
what is the efficiency of vitamin A absorption
70-90% dietary vitamin A
what is the efficiency of beta-caroteen absorption
20-50%
what is the transporter for vitamin A
scavenger receptor class B type I (SR-B1)
What are the s/s of vitamin D deficiency
dry, scaly skin, night blindness/nyctalopia, xerosis, xerophthalmia, bitot’s spots
How to assess vitamin A status
plasma retinol concentrations and relative dose response (RDR%)
What are the toxicity S/S for vitamin A
nausea, vertigo, diarrhea, skin desquamation/peeling, alopacia, muscle and bone pain, conjunctivitis, ocular pain, abdominal pain
