Nutrition - vitamin D

Question 1

What type of vitamin is vitamin D?

Answer 1

Fat soluble

Question 2

What is the role of vitamin D?

Answer 2

Maintain calcium blood levels - the activated form of vit D is important for calcium absorption

Question 3

What are sources of vitamin D?

Answer 3

Fish oils 
Egg yolk
Cheese 
Butter
Margarine 
Milk
Sunlight

Question 4

How is sunlight converted to vitamin D?

Answer 4

Sunlight and warmth (UV wavelengths 290-310nm) converts cutaneous (skin) 7-dehydrocholesterol to vitamins D

Question 5

What times are best for obtaining vitamin D from sunlight in the UK?

Answer 5

April -September 11am - 3pm

Question 6

What is the RNI for vitamin D?

Answer 6

Everyone over the age of 1y/o = 10ug

Recommendation to take a supplement during winter and autumn

Question 7

What can a deficiency is vitamin D lead to?

Answer 7

Rickets

Osteomalacia

Question 8

What metabolite measures a deficiency in vitamin D?

Answer 8

25 hydroxyvitamin D (250HD)

Question 9

What measurement of 250HD reports a deficiency?

Answer 9

<25nmol/L - deficiency

40-50nmol/L - insufficiency