Vitamin B3- Niacin

Question 1

Sources

Answer 1

-fortified breakfast cereals
-liver beef and fish
-some made in body

Question 2

Functions

Answer 2

-release of energy from food
-essential for heslthy skin
-prevents pellagra

Question 3

Deficiency

Answer 3

-Diarrhoea
-Dementia
-Dermatitis
-Death

Question 4

Excess

Answer 4

-lead to liver damage, a high dose causes dilation of the arteries and reduction of blood lipids

Question 5

Factors affecting absorption

Answer 5

-readily absorbed in small intestine
-alcohol inhibits formation
-sleeping pills and food processing destroys B3

-niacin made in body from amino acid tryptophan
-insoluble in water and small amounts lost during cooking