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1.1. Food And HealthFood And Health

Why Must We Eat ？

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Functions Of Food

• Energy-giving

Like car needs petrol

Like car needs petrol

We need foodWe need food ！！

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Functions Of Food

• Energy-giving

• Body-building

Food helps our body Food helps our body to grow and developto grow and develop

Food helps to repair the Food helps to repair the damaged cells and body damaged cells and body tissuestissues

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Functions Of Food

• Energy-giving

• Body-building

• Protective

Food helps to protect us from

Food helps to protect us from

diseases

diseases

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Nutrients In Food

5

Energy-giving

nutrients

Micro-nutrients

Carbohydrates VitaminsFats MineralsProteins

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Nutrients In Food

Functions of food

Food nutrients Body-building

Energy-giving

Protective

Food contains various nutrients.Different nutrients have

different functions.

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Nutrients In Food

Functions of food

Food nutrients Body-building

Energy-giving

Protective

ProteinsProteins

CarbohydratesCarbohydrates

FatsFats

VitaminsVitamins

MineralsMinerals

Five major nutrients

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Nutrients In Food

Functions of food

Food nutrients Body-building

Energy-giving

Protective

ProteinsProteins

CarbohydratesCarbohydrates

FatsFats

VitaminsVitamins

MineralsMinerals

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Body-building Food

Functions of food

Food nutrients Body-building

Energy-giving

Protective

ProteinsProteins

CarbohydratesCarbohydrates

FatsFats

VitaminsVitamins

MineralsMinerals

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• Most animal food contains rich proteins, vitamins and minerals

Body-building FoodWe are vegetarians, are there any other

types of food we can eat?

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• Soya bean products, beans and pulses are also good body-building food

Body-building Food

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Energy-giving Food

Functions of food

Food nutrients Body-building

Energy-giving

Protective

ProteinsProteins

CarbohydratesCarbohydrates

FatsFats

VitaminsVitamins

MineralsMinerals

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• Three main sources ：

Energy-giving Food

Energy-giving Food

Carbohydrates

Fats

Proteins

Starch

Sugar

What are the main sources of energy in our diet?

When having not enough carbohydrates and fats

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Protective Food

Functions of food

Food nutrients Body-building

Energy-giving

Protective

ProteinsProteins

CarbohydratesCarbohydrates

FatsFats

VitaminsVitamins

MineralsMinerals

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• Every food contains different types and amount of vitamins and minerals that can protect our bodies in different ways

Protective Food

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Functions Of Water• Transport nutrients to different parts of our body

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Functions Of Water• Transport nutrients to different parts of our body• Help to remove toxin and useless substances in

our body

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Functions Of Water

• Transport nutrients to different parts of our body• Help to remove toxin and useless substances in

our body• Help to digest and absorb nutrients

May I have some drinks, please?

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Functions Of Water

• Transport nutrients to different parts of our body• Help to remove toxin and useless substances in

our body• Help to digest and

absorb nutrients• Regulate body temperature

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Functions Of Water• Transport nutrients to different

parts of our body• Help to remove toxin and

useless substances in our body

• Help to digest and absorb nutrients

• Regulate body temperature• Keep eyes, membranes

and joints moist

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Functions Of Water

How much water should we take every day?

• Transport nutrients to different parts of our body• Help to remove toxin and useless substances in

our body• Help to digest and absorb nutrients• Regulate body temperature• Keep eyes, membranes and joints moist

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Sources Of Water• Drinks and fruits contain

lots of water

Drink 6-8 glasses of water every day

6-8

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Functions Of Dietary Fibre• Prevent constipation

• Lower chances of getting cancer

• Reduce level of cholesterol in blood

• Lower chances of getting blood vessel diseases

• Give us a sense of fullness and help to control our weight

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Types Of Dietary FibreSoluble

Dietary FibreInsoluble

Dietary FibreChanges after absorbing water

Jelly-likeTurn soft and expand like

sponge

Diseases help to prevent

High cholesterol level, blood vessel diseases

Constipation, some cancers and intestinal diseases

SourcesBeans, oatmeal and fruits

Vegetables and whole-grain cereals

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Multi-media Resources• Test your nutrition intuition• 慎防中暑 • 介紹實驗材料及儀器• 澱粉測試• 蛋白質測試 • 脂肪測試 • 食物與健康

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