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Authoritative PPT Summary
"Food Nutrition" Food in Life PPT Courseware
think about it
What nutrients do our bodies need for growth and development?
What nutrients can we get from a wide variety of foods? What specific foods contain these nutrients?
What nutrients are in food?
How do we study the nutrition of food?
Put the food on the fire.
Put iodine on food.
Place the food on the paper and press it.
Safety Tips: When using alcohol lamps, be sure to pay attention to safety.
Use a match (or lighter) to light an alcohol lamp. It is absolutely prohibited to use a burning alcohol lamp to light another alcohol lamp.
It is absolutely forbidden to add alcohol to a burning alcohol lamp.
After using the alcohol lamp, you must cover it with the lamp cap and do not blow it with your mouth.
Do not knock over the alcohol lamp. If spilled alcohol burns on the table, cover it immediately with a damp rag.
Nutritional content of food
protein
Protein is the main component of human muscles, organs, hair, nails and blood.
carbohydrate
Sugar is also the body's main source of energy.
Fat
Fat is the body's main source of energy.
Five functions:
(1) Supply and store heat energy
(2) Protect body tissues
(3) Supply essential fatty acids
(4) Promote the absorption of fat-soluble vitamins
(5) Maintain body temperature
Identify nutrients in food
Identification of proteins
1. Light the alcohol lamp;
2. If you burn food on an alcohol lamp, you will smell a smell like burning hair.
Protein smells like burnt hair when burned over fire.
Identification of starch
1. Add a drop of iodine into the starch paste and you will see the starch turn blue or blue-purple.
2. Drop iodine on different foods and observe the experimental phenomena.
If the food turns blue after being sprinkled with iodine, it indicates that the food contains starch.
think about it
We primary school students are in a period of growth and development. In order to keep ourselves healthy, what should we pay attention to when eating?
Health Tips:
1. Eat diversified food, not picky or picky eaters, regular and rationed meals
2. Eat a light diet and eat less fried, high-sugar and high-energy foods.
3. Eat in a civilized manner and do not read, watch TV, play or talk loudly during meals
practise
1. Fill in the blanks
1. The main nutrients needed by the human body are: ( ), ( ), ( ). In addition, it also includes salts, vitamins and water.
2. Put the food on the white paper and squeeze it. If there are oil stains left on the white paper, it means that the food contains ( ). Dropping iodine on the food is to test whether the food contains ( ). Special effects will occur when burning. Odor, indicating ( ) content is high.
2. Multiple choice questions
1. ( ) is a food rich in protein.
A.Peach B.Fish C.Rice
2. ( ) is a food rich in fat.
A.Steamed buns B.Vegetable oil C.Beef
3. ( ) is a food rich in sugar.
A. Soybean B. Starch C. Milk
4. ( ) is a food rich in vitamins and minerals.
A.Egg B.Milk C.Cucumber
3. Judgment questions
1. Fish meat is very nutritious and contains all the nutrients the human body needs. ( )
2. The life activities of the human body require the support of a variety of nutrients. ( )
3. Food is very rich in nutrients, usually classified into: proteins, sugars, lipids, vitamins, minerals and water. ( )
4. Protein is the main component of the human body's muscles, internal organs, hair, nails and blood. ( )
5. Lipids and sugars are the main sources of energy for the human body, and our bodies can store large amounts of fats and sugars. ( )
6. Vitamins and minerals regulate body functions and are indispensable nutrients for us to stay healthy. ( )
7. No one food contains all nutrients. ( )
8. Eating too much fat will make you fat and prone to diseases, so I don’t eat foods containing fat. ( )
9. When someone feels dizzy due to hunger, protein should be supplemented in time to restore his physical strength. ( )
10. When you have peeling fingers or oral ulcers, you need to eat more foods containing vitamins. ( )
5. Short answer questions
1. What effects do proteins, fats, sugars, vitamins and minerals have on our health and hair growth?
Answer: Protein is the main component of human muscles, internal organs, hair, nails, and blood. Fat and sugar are the main sources of energy for the human body. Our body can store a large amount of fat and sugar. Vitamins and minerals can regulate body functions. There are many types of them, and they are indispensable nutrients for us to stay healthy.
2. How to identify whether food contains fat?
Answer (1) Dip a cotton swab in some cooking oil and apply it on the paper. (2) Squeeze and slide fatty meat and peanuts on white paper respectively. Fatty foods will leave oil stains on the white paper.
3. How to identify whether food contains starch?
Answer (1) Add a drop of iodine into the starch paste and you will see the starch turn blue. (2) Put a drop of iodine on different foods and observe the experimental phenomenon. If you notice a blue color, it means the food contains starch.
4. Xiaojun used tweezers to pick up a piece of hair and put it on the flame. The hair was burnt and he smelled a burning smell. Based on this phenomenon, can you judge what ingredients are in the hair?
Answer: Protein will emit a burnt smell when burned on a flame, so the main component of hair is protein.
in conclusion:
1. Our bodies need various nutrients, which are stored in a wide variety of foods.
2. Rich food can absorb a variety of rich nutrients.
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"Food Nutrition" Food in Life PPT Courseware 3:
"Food Nutrition" Food in Life PPT Courseware 3 Student Activity Summary: What nutrients are common in the food labels collected by your group? Summary: The main nutrients are: protein, fat, inorganic salts, vitamins, sugars, water... ...
"Food Nutrition" Food in Life PPT Courseware 2:
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"Nutrition of Food" Food PPT Courseware 3:
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