Vitamin D

Question 1

activation of V-D

Answer 1

• 7-dehydrocholesterol-stays under skin until activated by UV
• cholecalciterol (D3)- made in the sun by activation of UV light
• 25-hydroxycholecalciterol (25-OH-D)- live, circulating form
• 1,25-dihydroxycholecalciterol (1,25-diOH-D3)- kidney, most active

Question 2

functions of V-D

Answer 2

• bone health
• regulation of Ca homeostasis and bone mineralization
• fracture prevention

GI- promotes intestinal absorption of Ca stimulation

Kidney- promotes reabsorption of Ca, increase Ca retention

Bone-mobilizes Ca from bone, initiates bone remodeling process

Question 3

V-D deficiency

Answer 3

• adults
• -osteomalacia
• -soft bones
• children
• -ricket
• -bow legs
• -given cod liver oil
• -breast fed African American babies at high risk

Question 4

V-D deficiency symptoms

Answer 4

-bone pain
-chronic pain
-restless sleep
-muscle weakness
-unexplained fatigue
-increased BP
-headache
depression

Question 5

groups at risk for V-D deficiency

Answer 5

• breast fed baby
• vegetarians
• dark skinned people
• elderly
• bed ridden
• religions
• seasons
• geographic location
• obesity
• inadequate sun exposure

Question 6

V-D recommendation

Answer 6

AI:

• 1-50- 5 mcg/d (200 IU)
• 51-70- 10mcg/d (400 IU)
• > 70- 15 mcg/d (600 IU)

Question 7

V-D food sources

Answer 7

• fish/seafood
• milk
• margarine
• liver
• beef
• egg
• sun= 20 min. = 10,000 = 25,000 IU

Question 8

V-D toxicity

Answer 8

10x RDA