Unit 2 Food and nutrition
Types of Nutrients
• INORGANIC NUTRIENTS
– Water
– Minerals

• ORGANIC NUTRIENTS
– Carbohydrates
– Lipids
– Proteins
– Vit...
Carbohydrates
•
•
•
•
•

They are one of the main dietary components.
Classification:
Monosaccharides.
Disaccharides
Polys...
Monosaccharides.
• Formed of a single molecule. They are used
directly by cells.
– Glucose
– Fructose: Fructose is known p...
Disaccharides
• They are formed by two monosaccharides.
– Lactose: It´s formed by glucose and galactose. We
can find lacto...
Polysaccharides
• They are formed by three or more
monosaccharides.
– Glycogen. It is the storage polysaccharide in animal...
• Monosaccharides can be directly absorbed in the
intestine, they dont need digestion.
• Disaccharides and polysaccharides...
Can you think examples of food rich in
carbohydrates?
• Cereals, fruit, vegetables, honey, sweets,
chocolate, sugar, potat...
Lipids
• They have bigger energetic value but it is
more difficult to absorb them. They can be
stored in the body.
• What ...
Saturated fats
• They don´t have double bonds between the
carbon atoms.
• Solid at environment temperature.
• We find them...
Unsaturated fats
• They have double bonds between the carbon
atoms.
• In vegetables and sea animals.
• They are usually li...
Other lipids
• Cholesterol Types???
• ( “bad cholesterol or LDL, good cholesterol or
HDL). Cholesterol can´t move on its o...
Essential fatty acids
• What are they?
• Fatty acids that can´t be synthesized in the
body and must be obtained from food....
Sources of Omega-3 and Omega-6
• Omega-3
– Salmon, Trout
– Seafood
– Walnuts

• Omega-6
– Sunflower seeds
– Walnuts
– Soya...
Proteins
• They are made of basic units called amino
acids.
• There are 20 different types of amino acids.
• There are 8 e...
• In our diet we can have animal or plant
proteins. The animal proteins have a higher
nutritive value for us.
• Think exam...
Homework
• Look info about this minerals, function, food
rich in them, and illnesses due to its lack.
• Calcium
• Magnesiu...
• Page 21 activities 3 and 9
• Listen to cd activities 3 and 5
• Page 34 activity 2. Listen to it.
Unit 2 Review
• Why do we need to eat and drink?
• What type of nutrients are there?
– INORGANIC AND ORGANIC

• Can you gi...
• What is fibre?
• Can we digest fibre?
• Give examples of food rich in fibre:
– Cereals, corn, wheat, rice, nuts, orange,...
• How much water do you drink daily?
• How much should you drink?
• Why is water necessary?
Tell us THINGS about VITAMINS!
• Give examples of sources of vitamins.
• Can any of the vitamins be made by the
intestinal...
Do we use energy when we sleep?
• We need energy to maintain
the vital functions.
What is this?
Check homework
• Page 25- activity 24
• Page 27- activity 26
• Read page 26.
• Do for next week:
• Page 27 activity 35
• M...
Unit 2 food and nutrition 3 eso
Unit 2 food and nutrition 3 eso
Unit 2 food and nutrition 3 eso
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Unit 2 food and nutrition 3 eso

  1. 1. Unit 2 Food and nutrition
  2. 2. Types of Nutrients • INORGANIC NUTRIENTS – Water – Minerals • ORGANIC NUTRIENTS – Carbohydrates – Lipids – Proteins – Vitamins
  3. 3. Carbohydrates • • • • • They are one of the main dietary components. Classification: Monosaccharides. Disaccharides Polysaccharides
  4. 4. Monosaccharides. • Formed of a single molecule. They are used directly by cells. – Glucose – Fructose: Fructose is known popularly as fruit's sugar. – Galactose – Ribose.
  5. 5. Disaccharides • They are formed by two monosaccharides. – Lactose: It´s formed by glucose and galactose. We can find lactose in the milk. – Sucrose: It is formed by glucose and fructose. We can find sucrose in honey. (it is the sugar we use to cook) •
  6. 6. Polysaccharides • They are formed by three or more monosaccharides. – Glycogen. It is the storage polysaccharide in animals. Humans can use Glycogen as an energy source by hydrolysis of the polymer using specific enzymes – Starch. It is a storage polysaccharide in plant cells, we can obtain it from potatoes. – Cellulose. It is the constituent of the cell walls in cell plants.We can not digest cellulose, because we lack the specific enzimes that can hydrolize it.
  7. 7. • Monosaccharides can be directly absorbed in the intestine, they dont need digestion. • Disaccharides and polysaccharides can´t be direclty absorbed, they must be digested until we obtain from them monosaccharides. • If we have high levels of glucose in the blood, part of it turns into glycogen. Glycogen is accumulated in the liver and inside the muscles. • On the opposite if there are low levels of glucose in the blood glycogen is broken into molecules of glucose. •
  8. 8. Can you think examples of food rich in carbohydrates? • Cereals, fruit, vegetables, honey, sweets, chocolate, sugar, potatoes, pasta, bread, rice. • • If we eat a lot of carbohydrates our body turns them into lipids (fat) • •
  9. 9. Lipids • They have bigger energetic value but it is more difficult to absorb them. They can be stored in the body. • What types of lipids are there? • Fats: Saturated and unsaturated. • Membrane lipids • Regulatory lipids
  10. 10. Saturated fats • They don´t have double bonds between the carbon atoms. • Solid at environment temperature. • We find them in animal and plant food. A lot of these fats are bad for our health, specially trans fats.. • E.g: palm oil, coconut oil. • We can find them in whole milk, butter, ham, pig meat, chocolates, pastries and processed foods made with trans fat from partially hydrogenated oil, yolk.
  11. 11. Unsaturated fats • They have double bonds between the carbon atoms. • In vegetables and sea animals. • They are usually liquid at environment temperature. • They are healthier than saturated fats. • E.g: Olive oil, dried fruits(avellanas, almendras, pistachos), sunflower oil, blue fish (omega3, omega6)
  12. 12. Other lipids • Cholesterol Types??? • ( “bad cholesterol or LDL, good cholesterol or HDL). Cholesterol can´t move on its own in the body. It combines with a protein, and a lipoprotein is formed. • • Fosfolipids. They form part of the cell membranes of the cells. •
  13. 13. Essential fatty acids • What are they? • Fatty acids that can´t be synthesized in the body and must be obtained from food. • Their names? • Linoleic and linoleic acid. These basic fats are used to build specialized fats called: – Omega-3 – Omega-6 • Why are they important? – They are important in the normal functioning of
  14. 14. Sources of Omega-3 and Omega-6 • Omega-3 – Salmon, Trout – Seafood – Walnuts • Omega-6 – Sunflower seeds – Walnuts – Soya bean – Corn – vegetable oils (corn, safflower, soybean,
  15. 15. Proteins • They are made of basic units called amino acids. • There are 20 different types of amino acids. • There are 8 esential amino acids that our body can not synthetise and therefore we have to add them in the diet. •
  16. 16. • In our diet we can have animal or plant proteins. The animal proteins have a higher nutritive value for us. • Think examples of food rich in: • Animal proteins: – meat, fish, cheese, eggs, milk. • Plant proteins: – leguminous plants (beans, green beans, peas), cereals, bread.
  17. 17. Homework • Look info about this minerals, function, food rich in them, and illnesses due to its lack. • Calcium • Magnesium • Iron • Iodine
  18. 18. • Page 21 activities 3 and 9 • Listen to cd activities 3 and 5 • Page 34 activity 2. Listen to it.
  19. 19. Unit 2 Review • Why do we need to eat and drink? • What type of nutrients are there? – INORGANIC AND ORGANIC • Can you give examples of carbohydrates? • What polisacharide is known as the energy store substance in plants? – STARCH • What about animals? What is our main energy store polisacharide? – GLYCOGEN
  20. 20. • What is fibre? • Can we digest fibre? • Give examples of food rich in fibre: – Cereals, corn, wheat, rice, nuts, orange, mushrooms • What about proteins? What can you tell us about them? – Structure – Can we make all the amino acids?
  21. 21. • How much water do you drink daily? • How much should you drink? • Why is water necessary?
  22. 22. Tell us THINGS about VITAMINS! • Give examples of sources of vitamins. • Can any of the vitamins be made by the intestinal bacteria? • If you have high amounts of vitamin C, can your body get rid of it ? How? • What about vitamin A? What is its function? • Vitamins E, K or D? • Vitamin B12?
  23. 23. Do we use energy when we sleep? • We need energy to maintain the vital functions.
  24. 24. What is this?
  25. 25. Check homework • Page 25- activity 24 • Page 27- activity 26 • Read page 26. • Do for next week: • Page 27 activity 35 • Make a list of items that must be included in a food label.

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