Vitamin D Flashcards
T or F
You can get a vitamin D toxicity from sunlight and supplements
False, not from sunlight
For most of the US essentially no vitamin D can be produced in the skin from ____ through ____
November through February
Ergocalciferol is also known as ___
Cholecalciferol is also known as __
D2
D3
Mushrooms and yeast are examples of which type of vitamin D?
D2/ ergocalciferol
T or F
Sundried or UV exposed mushrooms would have much more Vitamin D compared to fresh mushrooms
True
Fatty fish is an example of vitamin D3 or D2?
D3/ cholocalciferol
T or F
When looking at supplements, the ones with vitamin D3 are better than D2
True
Cholesterol is converted to ______ by the skins ____ glands. The glands secret it onto the skins surface where it becomes incorporated into the ____ layer of the skin
7-dehydrocholesterol
Sebaceous glands
Epidermis
Ultraviolet B from sunlight converts 7-dehydrocholesterol into _____ which will become cholecalciferol via _____. The photo products of this process are lumisterol and ____
Previtamin D3
Thermal isomerization
Tachysterol
Factors affecting vitamin D synthesis are time of year, clothes, ____, ____, ____, weight, time of day, ____, ____, ____, and sunblock
Age
Cloud cover
Pollution
Solar moon best
UVA/ UVB ratio
Skin color
Vitamin D production does not occur before ___ and ceases after ____ even in summer
9 am
4 pm
African Americans often need __-__ times longer sun exposure compared to caucasians to make the same amount of vitamin D
5-10
MED stands for what? What does it measure
Minimal erythema dose
Measures how much vitamin D we make
___ can be defined as the amount of time needed to cause skin to turn pink
MED
What is the RDA for vitamin D?
15 ug
1 ug= __ IU
40
T or F
Vitamin D is high in breast milk so no supplementation is needed
False, 400 IU supplement needed
What are natural sources of vitamin D?
Cod liver oil
Shiitake mushrooms
Egg yolk
Fatty fish/their oil (tuna, salmon, sardines
What makes fish have different amounts of Vit D?
Amount of zooplankton available in diet
What are fortified sources of Vitamin D? Which is not a very good source?
Cows milk
Cheese (not good source)
Yogurt
Orange juice
T or F
Vitamin D in foods is fairly stable and not prone to cooking, storage, or processing losses
True
What is the best source of vitamin D?
The sun
T or F
Dietary Vitamin D2 and D3 requires no digestion
True
Where is most vitamin D absorbed?
Small intestine