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Macronutrients Question Revision Mrs Keillor Nat 5 HFT.

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Presentation on theme: "Macronutrients Question Revision Mrs Keillor Nat 5 HFT."— Presentation transcript:

1 Macronutrients Question Revision Mrs Keillor Nat 5 HFT

2 What are the 5 main nutrients? Proteins, Carbohydrates, Fats, Vitamins, Minerals

3 Explain what macro- nutrients are and identify them. Nutrients needed by the body in relatively large amounts Protein, Carbohydrates and Fats

4 Name the two main functions of protein. Growth and repair of body cells Maintenance of body cells

5 What is the secondary function of protein? To provide energy

6 What are proteins made up of? Amino Acids (some of these are essential)

7 Proteins can be divided into two groups, what are they? HBV and LBV proteins High biological value and low biological value

8 What is the difference between HBV proteins and LBV proteins? HBV contain all the essential amino acids LBV lack one or more essential amino acids

9 Give examples of HBV proteins. Meat, fish, eggs milk, cheese, soy beans

10 Give examples of LBV proteins. Cereals (wheat rice oats), pulses (peas lentils), nuts Also gelatine (animal sources)

11 What can happen if you do not eat enough protein? Growth in children slowed down Cuts and wounds take longer to heal

12 What can happen if you eat too much protein? Converted to fat and lead to obesity if it is not used up as a secondary source of energy

13 What are the two main functions of carbohydrates in the body? To provide energy To provide warmth and so help maintain normal body temperature

14 Carbohydrates can be divided into two groups what are they? Sugars and Starches(TCC’s)

15 Give examples of starchy carbohydrates (TCC’s) Bread, pasta, cereals, potatoes

16 Give examples of Sugary carbohydrates. Cakes, biscuits, sweets, chocolate, jams. Fizzy drinks

17 Why is it recommended that we get most of our energy from the starchy group (TCC’s)? Starches are a good source of other nutrients They bulk out the diet, make you feeler for longer They do not encourage tooth decay

18 Starches are also a good source of NSP. What is NSP? Non starch polysaccharide also known as fibre

19 What can happen if you eat too much carbohydrate? Can be converted to fat in the body and can lead to obesity Too much sugar can lead to diabetes or tooth decay

20 What can happen if you don’t have enough carbohydrate? Lack of energy leading to tiredness Protein may be used as a source of energy instead of its main function for growth and repair

21 What is the difference between intrinsic and extrinsic sugars? Intrinsic are naturally occurring sugars in food e.g fruit Extrinsic are sugars added to food known as NMES (non-milk extrinsic sugars)

22 What are the 5 functions of fat? To provide warmth To provide energy To provide essential fatty acids To provide fat-soluble vitamins ADEK To surround and protect the organs

23 What are the two main types of fats? Saturated and Unsaturated

24 Give examples of saturated fats. Meat and meat products Fats e.g. butter Milk and dairy products- cream, cheese

25 Give examples of unsaturated fats. Olive Oil, rape seed oil, avocados, nuts and seeds, vegetable oil

26 What does LDL and HDL cholesterol stand for and which one is the good/bad cholesterol. Low density lipoprotein (Bad) High-density lipoprotein (Good)

27 What effect do saturated fats have on cholesterol? High level saturated fats raise blood cholesterol especially LDL. This sticks to arteries leading to blood clots and blockages of artery

28 What effect do unsaturated fats have on cholesterol? Help lower LDL cholesterol Slightly increase HDL cholesterol This cholesterol helps ferry the cholesterol away from the arteries to the liver where is broken down into bile

29 What are essential fatty acids? Necessary fats that humans cannot make. They must be obtained through the diet

30 What is the main essential fatty acid? Omega 3 fatty acids

31 What is omega 3 fatty acids needed for in children? For brain development in babies and young children's

32 What does omega 3 fatty acids help reduce in adults? The risk of blood clots, heart attacks and rheumatoid arthritis

33 What happens if you have too much fat? Can lead to obesity Can lead to high blood pressure and CHD

34 What happens if you don’t have enough fat? The intake of essential fatty acids such as omega 3 fatty acids may be reduced Fat soluble vitamins may be reduced

35 What are trans -fatty acids or hydrogenated fats? Polyunsaturated fats which have been artificially hardened by adding extra hydrogen

36 What can they increase the risk of? Heart disease, rheumatoid arthritis and some cancers

37 Where are they found? Hard margarine, biscuits, cakes, commercially fried foods

38 What are the effects of storage on fats? Exposure to air causes fats to deteriorate and become rancid Fats become rancid due to oxidation- oxygen is absorbed by the fat molecules and reacts to produce an unpleasant flavour and colour Oxidation is accelerated by light and any impurities in fat

39 What are the effects of preparation on fats? High concentration of fat is difficult to digest. Is easier to digest when surface of food is broken down e.g. grated cheese Combine a starchy food with the fatty food will make it easier to digest e.g. macaroni cheese

40 What is the effect of cooking on protein? Protein COAGULATE or set when heated e.g. egg whites set protein in milk forms a skin Protein in meat shrinks Heating the protein in wheat(gluten) helps bread to hold its structure

41 What is the effect of cooking on fats? Solid fats melt to liquid If oil continues to be heated a blue haze will be given off and the fat will ignite When fat reaches smoking point, it will go rancid and smell

42 What is the effect of dry heat on starches? Dextrin is formed. Known as dextrinisation. Gives baked items a brown colour. Overheating causes charring and burning.

43 What is the effect of moist heat on starch? Starch grains soften and swell. They then absorb the moisture which causes the grain to rupture. This releases starch

44 What is the effect of dry heat on sugar? Sugar melts the caramelises, going brown then burning The caramelisation of the sugar forms a golden crust on bakes items

45 What is the effect of moist heat on sugar? Sugar dissolves and becomes a syrup which caramelises then chars when the water has evaporated


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