Flashcards in Exam 2 Vitamins Deck (21)
How much vitamin C do we absorb?
70-90% absorbed at moderate intake (30 to 180mg/d)
Less than 50% absorbed at doses above 1 g/day
What were the major findings of the Cochrane Review?
-Severity of colds reduced
-No effect on the duration
-regular supplementation show that vitamin C reduces the duration
Is routine supplementation of Vitamin C recommended to reduce common cold?
No, it is not justified
How many water soluble vitamins of from the B Complex?
8 of the 9
Where are B complex vitamins widely distributed?
in our bodies
What are B complex vitamins important for?
Red blood cell formation
Are B Complex vitamins water or fat soluble?
How does B12 effect homocysteine?
Clear homocysteine levels from the blood
How does Folate effect homocysteine?
Folate is used in homocysteine metabolism
Why are DFE used to talk bout how much folate is consumed?
DFE's are used because folic acid has a different bioavailability than folate from food
What role do the B complex vitamins play in CVD risk reduction?
available evidence in inadequate to support a role for B vitamins in reducing CVD
What are the changes in B12 absorption rates in adults?
reduced stomach acidity, and intestinal disorders, have difficulty absorbing B12 from food
What are the fat soluble vitamins?
A,D, E, K
What did they find there was an increased risk of in beta-carotene supplementation?
an increase in lung cancer for current and former smokers
What were the min tke wy points from bet-carotene supplementation?
can cause an increase in lung cancer for smokers
hypothesis must be tested in larger RCT
positive association with cancer reduction
Where do each of the 5 steps of the synthesis of vitamin D take place?
absorbed by the sun through the skin
then go to liver and converts to 25OHD
to the kidney
Equals active form of vitamin D
What is the vitamin D debate about?
how much vitamin D does our body need?
What did the IOM find in their report with regards to Vitamin D?
to much of these nutrients my be harmful
the role for vitamin D is just bone health, nothing else
Did the IOM change their recommendations for vitamin D?
yes, they increased them
What are the functions of vitamin d?
regulation of gene expression
helps the body absorb calcium
improve bone health