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Flashcards in Fibre Deck (25):
1

Soluble fibre (2)

Effect glucose and lipid absorption from small intestine
Easily fermented by microflora in large intestine

2

Insoluble fibre (2)

Slowly and incompletely fermented in the colon
Pronounced effects on bowel habit

3

Sources of soluble fibres (2)

Oats
Legumes

4

Soluble fibre forms a ____ with water

Gel

5

How does soluble fibre effect glucose absorption from small intestine?

Slows release of glucose

6

How does soluble fibre effect lipid absorption?(2)

Bind to fat
Reduces LDL and total cholesterol absorption

7

What happens to soluble fibre in the large intestine?

Fermented by bacteria producing SCFA

8

Sources of insoluble fibre (3)

Whole grain
Veg
Fruit skin

9

Effects of insoluble fibre on digestion and absorption (4)

Decreases transit time
Helps pass waste
Prevents constipation
Prolongs satiety

10

High fibre sources (6)

Whole grain and whole meal
Beans and pulses
Fruit and veg
Nuts
Seeds
Oats

11

How much fibres should be consumed daily

30g

12

What is the most common source of fibre in the UK

Cereal

13

Symptoms of fibre overconsumption (3)

Flatulence
Bloating
Abdominal cramps

14

Which minerals may becomes deficient due to overconsumption of fibre?(3)

Zinc
Calcium
Iron

15

How does fibre over consumption cause mineral deficiencies?

Mineral binds to fibre and are eliminated instead of being absorbed

16

Soluble fibres _____ intestinal transit time

Increase

17

Insoluble fibres _____ intestinal transit time

Decrease

18

What does fermentation of soluble fibres produce?

SCFAs

19

Effects of soluble fibre on digestive enzyme function (3)

Impair ability of digestive enzymes to interact with nutrients in food
May inhibit intestinal peptidases
May inhibit pancreatic lipase

20

Dietary fibre is associated with reduced incidence of which cancers?(2)

Colorectal
Bowel

21

How may fibre reduce the risk of CVD (4)

Increased bile secretion
Decreased macronutritient absorption
Increase satiety
Delayed gastric emptying

22

Which CVD risk factors are improved by fibre consumption?(4)

Decreased LDL cholesterol
Weight regulation
Improved glucose metabolism
Decreased BP

23

What is the seaweed extract that is good for health?

Alginate

24

Effects of of alginate on digestion and absorption (5)

Slow glucose absorption
Increased satiety
Modulation of colonic microflora
Stool bulking
Reduced fat absorption by up to 75%

25

Define fibre (2)

Carbs that are neither digested or absorbed in the small intestine
And have a degree of polymerisation of 3 or more units, plus lignin