"Nutrition Substances in Food" Human Nutrition PPT Courseware 4

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"Nutrition Substances in Food" Human Nutrition PPT Courseware 4

Do you believe?

1. The energy we consume every day in normal life can increase the temperature of the same weight of water by about 50°C.

2. The number of cells renewed every hour in the human body is equivalent to dozens of times the total population of the world.

3. The total amount of food a person eats in his lifetime (based on the age of 70) is equivalent to more than 1,000 times his body weight.

Discussion: Do different foods contain the same types and amounts of nutrients?

Answer: different.

Discussion: Cells cannot live without matter and energy. So what is the relationship between the nutrients in food and the substances in human cells?

Answer: Nutrients in food are the source of substances contained in human cells.

1. Carbohydrates, fats, proteins

Self-taught thinking

1. What types of sugars are there? What are the food sources and functions of sugar?

2. What are the food sources and functions of fat?

3. What are the food sources and functions of protein?

carbohydrate

Function: The main energy supply substance and can directly provide energy.

Fat

Function: 1. Can provide energy to human body; 2. Main backup energy substance.

protein

Function: 1. Structural substances that make up the human body and promote human growth and development;

2. Repair and renewal of damaged cells;

3. Provide energy for human life activities.

Determine the energy in a food

1 The general process of inquiry experiments is _________, _________, _________, _________, _________, __________.

2 The assumptions made for different questions are _______, and some questions may not require assumptions.

3 This experiment determines the energy in food by measuring ____________________.

4 The function of a thermometer is __________; its purpose is ____________, and the heat energy released per gram of food is ___________.

Precautions

1. The food selected should be easily flammable;

2. Food should be fully burned;

3. The thermometer should avoid touching the wall and bottom of the device;

4. Wait until the mercury column of the thermometer stops rising before taking a reading.

5. Set up repeated groups and repeat the test (3 times) under the same conditions, and take the average value of the repeated groups.

making plans

1. In the center of the top of the empty can, cut a round hole slightly larger than the mouth of the conical bottle. Cut some holes around the round hole and at the bottom of the jar;

2. Pour 30ml of water into the Erlenmeyer flask and put a thermometer (the lower end is immersed in the water);

3. Install the test device according to the figure below and measure the water temperature;

4. Weigh out the weight of a dry peanut seed and put it on a flame to burn;

5. Place the freshly burned peanut seeds into the bottom of the Erlenmeyer flask as quickly as possible. After the peanut seeds are completely burned, measure the water temperature.

Precautions

1. Minimize errors during the experiment.

2. Weighing method.

3. When cutting cans, be sure to pay attention to safety.

4. Fill the conical flask with 30 ml of water.

5. Use small peanuts.

Discussion and communication

1. Is your data the same as that of other students? If different, what are the possible reasons?

2. From the effective conversion rate of energy in the burning of peanut seeds, please analyze the ways through which energy may be lost? How can we minimize the loss of calories during food combustion?

3. This research experiment is only done once. Are the results reliable? How do you think the results of experiments can be reliable? Why?

There are still many questions and endless exploration!

2. Water and inorganic salts

Water accounts for 60% to 70% of human body weight.

1. Provide an environment for cell life;

2. Participate in various life activities in the human body;

3. Participate in the transportation of nutrients, urea and other wastes.

3. Vitamins

1. There are many types, but they are not the main raw materials of cells and cannot provide energy for the human body;

2. The required amount is very small, but its effect on the human body is irreplaceable.

self-test

1. The most important energy storage substance in the human body is ( )

A.Protein B.Fat C.Saccharide D.Inorganic salt

2. Among the following substances, which one is not sugar ( )

A. Glucose B. Sucrose C. Starch D. Vitamins

3. Among the following foods, which one contains more fat ( )

A. Fatty meat B. Pure milk C. Steamed buns D. Rice

4. Which of the following foods of the same quality contains the most energy ( )

A. Peanuts B. Chinese cabbage

C. Soybean oil D. Wheat flour

5. Eating more yellow corn, carrots, etc. can prevent night blindness, because these foods are rich in _________, which can be converted into _________ in the human body.

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Update Time: 2024-10-02

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