"Nutrition Substances in Food" Human Nutrition PPT Courseware 6

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"Nutrition Substances in Food" Human Nutrition PPT Courseware 6

The grains, vegetables and fruits we eat come from plants, and the meat, eggs and milk come from animals. With the integration of the global economy, the sources of food are becoming increasingly widespread. Some foods may come from exotic places, and other foods may come from the depths of distant oceans. In short, it is mainly other organisms in the biosphere that provide nutrients to humans.

By studying this section, you will know:

1. What nutrients does the human body need?

2. What are the main functions of different nutrients?

Let's first take a look at the food carried by astronauts in space.

What are the functions of sugars, fats, and proteins?

Carbohydrates, fats and proteins are the main organic compounds that make up cells and can provide energy for life activities.

When patients cannot eat normally, they often need intravenous drips of glucose because glucose can provide energy to the body. Glucose, sucrose, and starch are all sugars.

Fatty meat, soybeans, peanuts and other foods contain more fat. Fat is also an important substance that supplies energy to the human body. However, fat stored in the human body is an important backup energy source. You may have this experience: the patient can't eat for several days and his body loses weight significantly. This is because nutrients such as fat stored in the body are consumed more and replenished less.

Why don’t children, teenagers, and the sick and wounded need to eat more milk, eggs, fish, and meat? It turns out that these foods are rich in protein. Protein is an important raw material for building and repairing the body. Human growth and development, as well as the repair and renewal of damaged cells, are inseparable from protein. In addition, proteins can also be broken down to provide energy for the body's life activities.

hint

Energy can be converted into each other. The chemical energy contained in organic matter can be converted into thermal energy, and thermal energy can change the temperature of water.

How much can a small peanut raise the temperature of 30 ml of water?

1. Ask the question: Do peanut seeds contain energy?

2. Make a hypothesis: Peanut seeds contain energy.

3. Make a plan: cans, Erlenmeyer flasks, thermometers, peanut seeds, scales, etc.

Discussion and communication

1. Is there any difference between the data you measured and the numbers in the appendix on pages 38-39? what is the reason?

2. Are the data you measured the same as those of other groups? If different, what is the reason?

3. This research experiment is only done once. Are the results reliable? What should be done?

Set up a repeat group: There are often errors in the data measured in the experiment, so it is necessary to set up a repeat group, that is, the same experiment must be repeated several times under the same conditions. If the experimental data of repeated groups are very similar, it means that the results of this experiment exclude the influence of chance factors. Experimental results should be averaged across replicate groups.

test you

1. On a long voyage, due to insufficient fresh vegetables, most sailors’ gums bleed. This is due to lack of ( )

A. Vitamin B B. Vitamin C C. Vitamin D D. Vitamin A

2. If someone has rough skin and cannot see clearly in the evening, the person may be deficient in: ( )

A. Vitamin C B. Vitamin B C. Vitamin D D. Vitamin A

3. Nutritionists recommend that Chinese teenagers eat more protein-rich foods such as milk, eggs, fish, and meat, because protein is: ( )

A. Substances necessary for human growth and development B. Main energy supply substances

C. Easily digestible substances D. Organic matter,

4. Sugar is the main source of energy needed by humans. Which of the following foods contains more sugar ( )

A. Eggs B. Tofu C. Fatty meat D. Steamed buns…

5. The nutritional requirements of adolescence are ( )

A. Eat more meat, not vegetables. B. Eat more vegetables, not meat.

C. Feel free to eat whatever you have. D. Take in nutrients comprehensively and reasonably.

In 1913, the Russian ship "Holy Hook" carried members of the Arctic expedition to overwinter among the ice in the Arctic Ocean. It didn't take long before the team members fell ill with a terrible disease. Their gums were cracked, congested and swollen, their teeth were loose, their faces were swollen, and their skin was bruised and bruised. Later, the doctor divided these patients into six groups and gave them fruit wine, alum preparation (a crystalline salt), vinegar, sea water, lemons and nutmeg respectively. They found that those who ate two lemons a day quickly recovered their health. Please analyze:

1. What disease did the team members on the ship have?

2. Why can lemon treat this disease?

3. What is the reason why seafarers are most likely to get this disease?

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Update Time: 2024-10-18

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