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Section 8.1 Carbohydrates, Fats, and Proteins Slide 1 of 35 Objectives Name the three classes of nutrients that supply your body with energy. Explain how.

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Presentation on theme: "Section 8.1 Carbohydrates, Fats, and Proteins Slide 1 of 35 Objectives Name the three classes of nutrients that supply your body with energy. Explain how."— Presentation transcript:

1 Section 8.1 Carbohydrates, Fats, and Proteins Slide 1 of 35 Objectives Name the three classes of nutrients that supply your body with energy. Explain how the body obtains energy from foods. Section 8.1 Carbohydrates, Fats, and Proteins Describe the roles that carbohydrates, fats, and proteins play in your body.

2 Section 8.1 Carbohydrates, Fats, and Proteins Slide 2 of 35 For each of your responses, explain why you gave the answer you did. Switch to QuickTake version of the quiz. Quick Quiz Which of these statements are always true? Which are sometimes true? Which are always false? Foods that are high in calories are unhealthy. You should avoid foods with sugars in them. You should avoid fats in your diet. Vegetarian diets are low in protein. Snacking is bad for you.

3 Section 8.1 Carbohydrates, Fats, and Proteins Slide 3 of 35 Food supplies your body with nutrients, substances that the body needs to regulate bodily functions, promote growth, repair body tissues, and obtain energy. Foods Supply Nutrients There are six classes of nutrients: carbohydrates, fats, proteins, vitamins, minerals, and water. Carbohydrates, fats, and proteins can all be used by the body as sources of energy.

4 Section 8.1 Carbohydrates, Fats, and Proteins Slide 4 of 35 The foods you eat are your body’s energy source. Foods Supply Energy You need energy to maintain your body temperature, keep your heart beating, and enable you to understand what you read.

5 Section 8.1 Carbohydrates, Fats, and Proteins Slide 5 of 35 When your body uses the nutrients in foods, a series of chemical reactions occurs inside your cells. As a result, energy is released. Fuel for Your Body Metabolism is the chemical process by which your body breaks down food to release this energy. Metabolism also involves the use of this energy for growth and repair of body tissue.

6 Section 8.1 Carbohydrates, Fats, and Proteins Slide 6 of 35 The amount of energy released when nutrients are broken down is measured in units called calories. What are Calories? The more calories a food has, the more energy it contains.

7 Section 8.1 Carbohydrates, Fats, and Proteins Slide 7 of 35

8 Section 8.1 Carbohydrates, Fats, and Proteins Slide 8 of 35

9 Section 8.1 Carbohydrates, Fats, and Proteins Slide 9 of 35 Carbohydrates are nutrients made of carbon, hydrogen, and oxygen. Carbohydrates Carbohydrates supply energy for your body’s functions.

10 Section 8.1 Carbohydrates, Fats, and Proteins Slide 10 of 35 Simple carbohydrates are also known as sugars. Simple Carbohydrates Complex carbohydrates are made up of sugars that are linked together chemically to form long chains. Complex Carbohydrates

11 Section 8.1 Carbohydrates, Fats, and Proteins Slide 11 of 35 Fiber is a type of complex carbohydrate that is found in plants. Fiber A high-fiber diet may help prevent heart disease may reduce the risk of colon cancer helps prevent constipation

12 Section 8.1 Carbohydrates, Fats, and Proteins Slide 12 of 35 Fiber

13 Section 8.1 Carbohydrates, Fats, and Proteins Slide 13 of 35 At a meal, you usually eat more carbohydrates than your body can immediately use. Your Body’s Energy Reserves The extra glucose is converted into a type of starch called glycogen. If you eat so many carbohydrates that the body’s glycogen stores are full, then the excess carbohydrates are stored as fat instead.

14 Section 8.1 Carbohydrates, Fats, and Proteins Slide 14 of 35 Nutritionists recommend that 45 to 65 percent of a person’s daily calorie intake come from carbohydrates. Daily Carbohydrate Intake It is better to eat foods rich in complex carbohydrates rather than simple carbohydrates.

15 Section 8.1 Carbohydrates, Fats, and Proteins Slide 15 of 35 Fats are made of carbon, hydrogen, and oxygen. Fats Fats supply your body with energy, form your cells, maintain body temperature, and protect your nerves.

16 Section 8.1 Carbohydrates, Fats, and Proteins Slide 16 of 35 Unsaturated Fats have at least one unsaturated bond in a place where hydrogen can be added to the molecule. Unsaturated Fats Unsaturated fats are usually liquid at room temperature. Unsaturated fats are classified as either monounsaturated fats or polyunsaturated fats.

17 Section 8.1 Carbohydrates, Fats, and Proteins Slide 17 of 35 Fats that have all the hydrogen the carbon atoms can hold are called saturated fats. Saturated Fats Saturated fats are usually solid at room temperature. Too much saturated fat in your diet can lead to heart disease.

18 Section 8.1 Carbohydrates, Fats, and Proteins Slide 18 of 35 Nutritionists recommend that 20 to 35 percent of your calories come from fat, primarily unsaturated fat. Daily Fat Intake

19 Section 8.1 Carbohydrates, Fats, and Proteins Slide 19 of 35 Which Foods Contain Fats? Materials In this activity you will create a mobile that balances the three aspects of health. brown paper bag scissors marker dropper potato chip milk chocolate carrot whole milk skim milk apple juice ground beef

20 Section 8.1 Carbohydrates, Fats, and Proteins Slide 20 of 35 Which Foods Contain Fats? Let the squares dry. Then hold each square up to a light. Rub each food on the square with its name. If the food is a liquid, place a few drops on the square. Cut a brown paper bag into squares about 3 inches on each side. Write the name of each food on a square. Try This

21 Section 8.1 Carbohydrates, Fats, and Proteins Slide 21 of 35 Which Foods Contain Fats? Does your daily diet include many foods that are high in fat? (To be sure, try testing some foods that you commonly eat.) How could you reduce the amount of fat that you consume each day? Think and Discuss Which squares had a spot when you held them up to the light? Those foods contain fat. Which squares did not have a spot?

22 Section 8.1 Carbohydrates, Fats, and Proteins Slide 22 of 35 Cholesterol is a waxy, fatlike substance that is found only in animal products. Cholesterol Your body needs a certain amount of cholesterol to make cell membranes and nerve tissue, certain hormones, and substances that aid in the digestion of fat.

23 Section 8.1 Carbohydrates, Fats, and Proteins Slide 23 of 35 Trans fats are made when manufacturers add hydrogen to the fat molecules in vegetable oils. Trans Fats Trans fats are found in margarine, chips, and commercially baked goods. Trans fat seems to have many of the negatives of saturated fat.

24 Section 8.1 Carbohydrates, Fats, and Proteins Slide 24 of 35 Click above to go online. For: More on healthy eating

25 Section 8.1 Carbohydrates, Fats, and Proteins Slide 25 of 35 Proteins Proteins can serve as a source of energy. The most important function of proteins is their role in the growth and repair of your body’s tissues. Nutrients that contain nitrogen as well as carbon, hydrogen, and oxygen are called proteins.

26 Section 8.1 Carbohydrates, Fats, and Proteins Slide 26 of 35

27 Section 8.1 Carbohydrates, Fats, and Proteins Slide 27 of 35

28 Section 8.1 Carbohydrates, Fats, and Proteins Slide 28 of 35 Proteins are long chains of smaller “links” that are bound together chemically. Amino Acids These smaller substances are known as amino acids.

29 Section 8.1 Carbohydrates, Fats, and Proteins Slide 29 of 35 The nine amino acids that the body cannot manufacture are called essential amino acids. Essential Amino Acids

30 Section 8.1 Carbohydrates, Fats, and Proteins Slide 30 of 35 Protein from animal sources is complete protein. Complete and Incomplete Proteins It contains all nine essential amino acids. Most protein from plant sources is incomplete protein. It lacks one or more of the essential amino acids.

31 Section 8.1 Carbohydrates, Fats, and Proteins Slide 31 of 35 Nutritionists recommend that 10 to 35 percent of your calories come from proteins. Daily Protein Intake People who don’t eat meat can combine two or more plant protein sources that, taken together, provide all the essential amino acids. Proteins for Vegetarians

32 Section 8.1 Carbohydrates, Fats, and Proteins Slide 32 of 35 Vocabulary nutrientA substance in foods that the body needs to regulate bodily functions, promote growth, repair body tissues, and obtain energy. metabolismThe chemical process by which the body breaks down food to release energy. calorieUnit for the amount of energy released when nutrients are broken down. carbohydrateA nutrient made of carbon, hydrogen, and oxygen and that supplies energy. fiberA way of dealing with an uncomfortable or unbearable feeling or situation.

33 Section 8.1 Carbohydrates, Fats, and Proteins Slide 33 of 35 Vocabulary unsaturated fatA fat with at least one unsaturated bond in a place where hydrogen can be added to the molecule. saturated fatA fat that has all the hydrogen the carbon atoms can hold. cholesterolA waxy, fatlike substance that is found only in animal products. fatA nutrient made of carbon, hydrogen, and oxygen; supplies energy, forms cells, maintains body temperature, and protects nerves.

34 Section 8.1 Carbohydrates, Fats, and Proteins Slide 34 of 35 Vocabulary proteinA nutrient that contains nitrogen as well as carbon, hydrogen, and oxygen; needed for the growth and repair of body tissues. amino acidSmall units that are bound together chemically to form proteins. trans fatThe type of fat produced when manufacturers add hydrogen to the fat molecules in vegetable oils.

35 Section 8.1 Carbohydrates, Fats, and Proteins Slide 35 of 35 QuickTake Quiz Click to start quiz.

36 Section 8.1 Carbohydrates, Fats, and Proteins Slide 36 of 35 End of Section 8.1 Click on this slide to end this presentation.


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