(a) Define the term 'dietary fibre'. [2] (b) Give two food sources of dietary fibre. [2] (c) Explain two reasons why dietary fibre is important in the diet....
Question 1 Report
(a) Define the term 'dietary fibre'. [2]
(b) Give two food sources of dietary fibre. [2]
(c) Explain two reasons why dietary fibre is important in the diet. [4]
Answer Details
(a) Define the term 'dietary fibre'. [2]
- Dietary fibre is the part of plant foods (1) that cannot be digested by the human body (1).
OR
- It is also known as roughage or non-starch polysaccharide (NSP) (1) and comes from the cell walls of plants (1).
(b) Give two food sources of dietary fibre. [2]
One mark each (max 2):
- Wholemeal bread/wholegrain cereals (1)
- Fruits (1)
- Vegetables (1)
- Pulses such as lentils and beans (1)
- Brown rice (1)
- Nuts and seeds (1)
(c) Explain two reasons why dietary fibre is important. [4]
Two marks per reason (max 4):
- Fibre absorbs water and adds bulk to food waste in the large intestine (1), which helps food move through the digestive system and prevents constipation (1).
- Eating enough fibre may help to reduce the risk of bowel cancer (1), because food waste passes through the body more quickly so harmful substances spend less time in contact with the bowel wall (1).
- Fibre helps a person to feel full after eating (1), which can help to prevent overeating and obesity (1).
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