Nutrition and Health. Micronutrients - Vitamins
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1 Nutrition and Health Micronutrients - Vitamins
2 Topics Vitamins Water-soluble vitamins vitamin B vitamin C Fat-soluble vitamins vitamin A vitamin D vitamin E vitamin K 2
3 VITAMINS 3
4 Vitamins Vitamins are micronutrients They are natural substances found in foods that have different functions in the human body The human body needs them in very small quantities Vitamins are essential for good health and growth There are two groups of vitamins water-soluble vitamins fat-soluble vitamins 4
5 WATER-SOLUBLE VITAMINS 5
6 Water-Soluble Vitamins Water-soluble vitamins dissolve in water The excess water-soluble vitamins from intake will be excreted through urination and cannot be stored in the body Therefore, foods rich in these vitamins need to be consumed regularly Water-soluble vitamins are heat-unstable, and can be lost upon heat treatment of food Water-soluble vitamins include: - vitamin B complex (thiamine, riboflavin, niacin, pyridoxine, folate, cobalamin) - vitamin C 6
7 Water-Soluble Vitamins Vitamins Functions Sources Deficiency Reference Nutrient Intakes (RNI) ** for adults per day Vitamin B 1 (Thiamine) Vitamin B 2 (Riboflavin ) Vitamin B 3 (Niacin) Helps the release of energy from nutrients Needed for healthy skin Helps release energy to cells and in the body s use of carbohydrates Involved in the energy producing reactions Helps in maintaining healthy nervous system and skin Cereals, meat, liver, milk and dairy products, eggs and vegetables (including potatoes) Cereals, milk and dairy products, meat, liver, kidney, eggs, green vegetables Meat (especially offal), cereals, potatoes, bread Shortage slows growth and development Mild deficiency causes tiredness and depression Severe deficiency causes beriberi Shortage slows growth and development May cause skin and eye problems Severe deficiency causes pellagra Symptoms include diarrhoea, dementia and dermatitis Men: 1.0 mg Women: 0.8 mg Increase intake during pregnancy and lactation Men: 1.3 mg Women: 1.1 mg Increase intake during pregnancy and lactation Men: 17.0 mg Women: 13.0 mg Increase intake during pregnancy and lactation ** Source: British Nutrition Foundation 7
8 Water-Soluble Vitamins Vitamins Functions Sources Deficiency Reference Nutrient Intakes (RNI) ** for adults per day Vitamin B 6 (Pyridoxine) Vitamin B 9 (Folate) Needed for the metabolism of protein Helps formation of red blood cells and proper functioning of the nervous system Needed for red blood cell production Liver, kidney, fish, wheat germ, poultry, leafy vegetables, potatoes, cereals Cereals, nuts and pulses, leafy vegetables (such as spinach) Rare, but deficiency in infants can cause convulsions Mild deficiency leads to tiredness A folate deficiency can cause megaloblastic anaemia Deficiency in the early stages of pregnancy is associated with neural tube defects in foetus Men: 1.4 mg Women: 1.2 mg 200 µg Increase intake during pregnancy and lactation Woman planning pregnancy, or in the first 12 weeks, should supplement their diet with 0.4 mg per day ** Source: British Nutrition Foundation 8
9 Water-Soluble Vitamins Vitamins Functions Sources Deficiency Reference Nutrient Intakes (RNI) ** for adults per day Vitamin B 12 (Cobalamin) Vitamin C (Ascorbic Acid) Helps prevent certain forms of anaemia Helps cells divide Protects nervous system Maintains body s connective tissue, important for wound healing Helps iron absorption Has antioxidant properties All animal foods liver, fish, meat, cheese, milk, eggs Fruits and vegetables, especially citrus fruits (including oranges and lemons) Deficiency can lead to pernicious anaemia and neurological problems Deficiency may cause scurvy 1.5 µg 40 mg ** Source: British Nutrition Foundation 9
10 VITAMIN B 10
11 Vitamin B Scientists originally thought there was only one vitamin B, but then discovered that there were several more that had similar functions in the body They are all grouped together and are known as the vitamin B complex, such as - vitamin B 1 (thiamine) - vitamin B 2 (riboflavin) - vitamin B 3 (niacin) - vitamin B 6 (pyridoxine) - vitamin B 9 (folate) - vitamin B 12 (cobalamin) 11
12 Functions of Vitamin B 1 (Thiamine) Helps release energy from carbohydrates Helps the body grow Helps the nerves work properly 12
13 Sources of Vitamin B 1 (Thiamine) Vitamin B 1 is not stored in the body, so a continuous daily supply is needed Foods that provide vitamin B 1 : cereals such as wheat and rice (especially whole grain) and cereal products meat (especially pork, bacon and ham) and offal (especially liver, kidney and heart) eggs, fish roe milk and dairy products seeds, nuts, beans 13
14 Deficiency of Vitamin B 1 (Thiamine) Deficiency of vitamin B 1 can cause beriberi A diet low in thiamine Beriberi Dry beriberi Wet beriberi Affects the heart and circulatory system, and can cause heart failure Damages the nerves and can lead to decreased muscle strength and eventually, muscle paralysis 14
15 Beriberi A diet with a good supply of vitamin B 1 Adopt a balanced diet Prevention of beriberi 15
16 Functions of Vitamin B 2 (Riboflavin) Helps release energy from carbohydrates, fats and proteins Needed for growth in children 16
17 Sources of Vitamin B 2 (Riboflavin) Foods that provide vitamin B 2 : cereals such as wheat and rice (especially whole grain) and cereal products meat (especially pork, bacon and ham) and offal (especially liver, kidney and heart) eggs, fish roe milk and dairy products seeds, nuts, beans 17
18 Deficiency of Vitamin B 2 (Riboflavin) Low intake can lead to dryness and peeling skin on the nose, cracks and redness at the corners of mouth, and a swollen tongue It affects vision, including blurred vision, sensitivity to light, itchy and watering eyes 18
19 Functions of Vitamin B 3 (Niacin) Helps release energy from food Used to lower the levels of fat in the blood 19
20 Sources of Vitamin B 3 (Niacin) Foods that provide vitamin B 3 : cereals such as wheat and rice (especially whole grain) and cereal products meat (especially pork, bacon and ham) and offal (especially liver, kidney and heart) eggs, fish roe milk and dairy products seeds, nuts, beans Although the liver can synthesise niacin from tryptophan (a kind of amino acid), the speed is extremely slow 20
21 Deficiency of Vitamin B 3 (Niacin) Deficiency of vitamin B 3 can cause pellagra The symptoms of pellagra are known as the three D s: Diarrhoea Dermatitis (rough and sore skin) Dementia (confusion, memory loss, unable to speak properly) 21
22 Excess of Vitamin B 3 (Niacin) Very high dosage may cause liver damage 22
23 Functions of Vitamin B 6 (Pyridoxine) Helps the body use protein, fat and carbohydrate Involved in enzyme reactions and protein metabolism in the body 23
24 Sources of Vitamin B 6 (Pyridoxine) Foods that provide vitamin B 6 : liver and kidney poultry fish wheat germ, cereals leafy vegetables potatoes 24
25 Deficiency of Vitamin B 6 (Pyridoxine) Vitamin B 6 deficiency is associated with: headaches general aching and weakness anaemia 25
26 Excess of Vitamin B 6 (Pyridoxine) High dosage may induce poor functioning of sensory nerves 26
27 Functions of Vitamin B 9 (Folate) Folate is the natural form of the vitamin found in food, folic acid is the man-made vitamin in supplements and added to foods Helps the body use protein Important in making red blood cells Involved in the synthesis and repair of DNA (deoxyribonucleic acid) in the body cells Aids rapid cell division and growth, especially the cells in the bone marrow Folate helps prevent the foetus from developing major congenital deformities of the brain or spine, including neural tube defects 27
28 Sources of Vitamin B 9 (Folate) Foods that provide folate: green and leafy vegetables (e.g. spinach and Chinese kale) liver fruits (e.g. oranges and berries) asparagus, okra beans (e.g. mung beans and red beans) and peas (e.g. chickpeas) 28
29 Deficiency of Vitamin B 9 (Folate) Deficiency of folate can lead to a wide range of problems including: effects in the digestive system, such as loss of appetite, nausea, diarrhoea and soreness in the mouth megaloblastic anaemia red blood cells are not fully mature and become larger and fewer than normal therefore, not able to carry enough oxygen to body tissues congenital deformities in foetus 29
30 Effects of Deficiency of Vitamin B 9 (Folate) in the Digestive System Inadequate intake of folate or folic acid Cells in the digestive system are not dividing properly Other nutrients are not absorbed Loss of appetite, nausea, diarrhoea and soreness in the mouth 30
31 Megaloblastic Anaemia Inadequate intake of folate or folic acid Red blood cells in the bone marrow are not dividing and mature properly Red blood cells become very large and are not able to deliver enough oxygen around the body Shortness of breath, muscle weakness, extreme tiredness, a lack of energy 31
32 Congenital Deformities in Foetus Very high demand of folate or folic acid during pregnancy (about 5 times more than normal) Pregnant women do not have adequate intake of folate or folic acid before conception Improper development of embryo during early stage of pregnancy Spina bifida occurs in foetus a congenital deformity in the spine 32
33 Functions of Vitamin B 12 (Cobalamin) Cobalamin is needed to form a protective coating around nerve cells to make them work properly Important for the production of new cells 33
34 Sources of Vitamin B 12 (Cobalamin) Cobalamin can be stored in the liver Synthesised only by microorganisms Therefore, only presents in animal foods; none in plant foods, such as meat and liver poultry and egg fish milk and dairy products 34
35 Deficiency of Vitamin B 12 (Cobalamin) Prevents the nerves from working properly and leads to: numbness or tingling, muscle weakness, and problem in walking paralysis, memory loss and confusion People who have problem absorbing cobalamin can develop pernicious anaemia a condition in which the body does not have enough healthy red blood cells 35
36 VITAMIN C 36
37 Functions of Vitamin C (Ascorbic Acid) Enable the body to absorb iron from food For the production of collagen (a kind of protein) in the body Collagen is the protein in connective tissue which is the substance that binds the body cells together As an antioxidant which helps protect the body from polluting chemicals that get into the body from the air, water or in food 37
38 Sources of Vitamin C (Ascorbic Acid) Foods that provide vitamin C: fruits, e.g. citrus fruits, kiwi fruit vegetables, e.g. green, leafy vegetables (except for lettuce), broccoli, green peppers, potatoes There is a very small amount of vitamin C in liver and fresh milk 38
39 Deficiency of Vitamin C (Ascorbic Acid) A deficiency is rare but is occasionally found in the elderly and children who have very little fresh fruits and vegetables in their diet Slight deficiency of vitamin C may cause anaemia because not enough iron is absorbed 39
40 Deficiency of Vitamin C (Ascorbic Acid) A severe deficiency causes scurvy with the following symptoms: bleeding gums poor wound healing damage to bone and other tissues 40
41 Deficiency of Vitamin C (Ascorbic Acid) Inadequate intake of vitamin C Anaemia Inadequate formation of collagen Tiredness Weakness Scurvy Bleeding gums Poor wound healing Damage to bone and other tissues 41
42 FAT-SOLUBLE VITAMINS 42
43 Fat-Soluble Vitamins Fat-soluble vitamins dissolve in fats The excess fat-soluble vitamins from intake will be stored in the body (liver and fatty tissue) The body can retrieve these vitamins when needed, therefore, can consume less than daily need Fat serves as a medium for the body to absorb these vitamins Fat-soluble vitamins are relatively heat-stable as compared to water-soluble vitamins Fat-soluble vitamins include: - vitamin A - vitamin D - vitamin E - vitamin K Some fat-soluble vitamins can be easily oxidised, e.g. vitamin A and E 43
44 Fat-Soluble Vitamins Vitamins Functions Sources Deficiency Reference Nutrient Intakes (RNI) ** for adults Vitamin A retinol (animal origin) Vitamin A betacarotene (plant origin) Good for night vision, healthy skin and tissue Beta-carotene is an antioxidant vitamin which might protect against cancer Vitamin D Works with calcium to form healthy bones and teeth Liver, oily fish, whole milk, butter, margarine, cheese, eggs Carrots, green vegetables, orange and red fruits and vegetables The skin can make vitamin D after exposure to sunlight Margarine, oily fish, liver Long-term deficiency may lead to night blindness Deficiency in children can cause rickets Men: 700 µg Women: 600 µg 10 µg ** Source: British Nutrition Foundation 44
45 Fat-Soluble Vitamins Vitamins Functions Sources Deficiency Reference Nutrient Intakes (RNI) ** for adults per day Vitamin E Good for healthy skin. May help protect against heart disease Vitamin K Involved with clotting of blood Eggs, nuts, seeds, cereal products, vegetable oils Green vegetables, pulses, fruits, cereals, meat, liver Also made by bacteria in the large intestine Deficiency is rare, normally enough supply in a balanced diet Deficiency is rare, normally enough supply in a balanced diet No RNIs but safe intakes have been set at more than 4 mg for men and more than 3 mg for women No RNIs but safe intake is 1 µg per 1 kg body weight ** Source: British Nutrition Foundation 45
46 VITAMIN A 46
47 Functions of Vitamin A Helps the body grow and develop Keeps the lining of the throat, the digestive system and the lungs moist and free from infection Keeps the skin healthy Makes a substance in the retina so the eyes can see well enough in dim light As an antioxidant which helps stop substances that get into the body from the air, water and foods from damaging it 47
48 Sources of Vitamin A Vitamin A can be found in foods in two different forms: Retinol is pure vitamin A primarily found in animal sources that contain fat, e.g. milk, cheese, butter, oily fish (e.g. tuna, mackerel, sardines) and liver Beta-carotene is a precursor of vitamin A found in plant foods, e.g. carrots, oranges, red peppers, dark green leafy vegetables, tomatoes and pumpkin 48
49 Deficiency of Vitamin A Children do not grow properly Difficult for the body to fight infection Develops night blindness which is a condition of not being able to see in dim light and will eventually lead to blindness 49
50 Excess of Vitamin A Too much vitamin A is poisonous to the body May lead to liver and bone damage 50
51 VITAMIN D 51
52 Functions of Vitamin D Vitamin D is essential for the formation of strong and healthy bones and teeth especially during childhood and adolescence Helps control the amount of calcium absorbed from food 52
53 Sources of Vitamin D The skin can make vitamin D after exposure to sunlight in about 10 to 15 minutes and stored in the liver Foods that provide vitamin D: oily fish, like tuna, mackerel and salmon foods fortified with vitamin D, e.g. margarine liver cheese egg yolks 53
54 Deficiencies of Vitamin D If there is a shortage of vitamin D, the calcium cannot be absorbed, and the teeth and bones can become weak This can lead to rickets in children where the bones become soft and bend out of shape 54
55 Rickets Shortage of vitamin D Poor calcium absorption from food Bones become soft and bend out of shape 55
56 VITAMIN E 56
57 Functions of Vitamin E Vitamin E is an antioxidant which helps stop substances that get into the body from the air, water and elsewhere from damaging it Needed to make sure that the cell walls in the body stay healthy It is thought to reduce the risk of people developing some types of cancers and heart disease 57
58 Sources of Vitamin E Foods that provide vitamin E: vegetable oils, such as wheat germ, sunflower, safflower, corn and soybean oils nuts, such as almonds, peanuts and hazelnuts seeds, such as sunflower seeds vegetables, such as spinach and broccoli fruits, such as avocado 58
59 Deficiency of Vitamin E Deficiency is very rare, intake is normally enough in a balanced diet 59
60 VITAMIN K 60
61 Functions of Vitamin K Helps the blood clot the blood will thicken and clot at the place where the injury takes place in order to allow it to be repaired and to stop the body from losing too much blood 61
62 Sources of Vitamin K Foods that provide vitamin K: vegetables, especially green, leafy vegetables cheese liver, bacon coffee, green tea Chinese herbal medicine It is also made by bacteria that live naturally in the intestines 62
63 Deficiency of Vitamin K Deficiency is rare, intake is normally enough in a balanced diet 63
64 References British Nutrition Foundation (2016). Nutrition Requirements. Retrieved from 0Requirements_Revised%20Oct% pdf Dietitians of Canada (2014). Food Sources of Folate. Retrieved from Minerals/Facts-about-Folate.aspx Insel, P. M., Ross, D., McMahon, K., & Bernstein, M. (2019). Discovering nutrition. Burlington, MA: Jones & Bartlett Learning. Otten, J. J., Hellwig, J. P., & Meyers, L. D. (2006). Dietary reference intakes: The essential guide to nutrient requirements. Washington, D.C.: National Academies Press. 64
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