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Name Duty
Cheung Wai Yee Author of p.1 – p.9
Fung Ying Chi Author of p.10 – p.18
Leung Shuk Ming Author of p.19 – p.25
Duty List:
Introduction:
1.1. Target Audience:Target Audience:
F.3 students with average ability.F.3 students with average ability.
2. How to use these slides?2. How to use these slides?
This is a teaching material for lecturing. These slides will be accompanied with food labels and some food samples.
Objectives:
Balanced dietsDeficiency diseases
Functions of different food substances
Function of food Types of food substances
We should know……
What is Food?
• Food is something that living organisms take into their bodies to provide energy and to help them to develop and to live.
• The food for Human is made of SEVEN components. These components are called food substances.
Seven Food Substances
Food Substances
Carbohydrates
Proteins
Water
Dietary Fibre Minerals
Vitamins
Fats
Carbohydrates
Food source:
Functions of carbohydrates: Supply energy
Food reserve Structural materials
Fats
Food source:
Functions of fat:
Supply energy Food reserve
Heat insulator
Structural material of cell membrane
Vitamins
Examples of vitamins:
Vitamin
Vitamin
Vitamin
A
C
D
Functions of vitamins:
To keep us healthy
Deficiency diseases
- Lack of certain vitamin and mineral will cause deficiency disease
Food substancesFood substances Deficiency diseaseDeficiency disease
Vitamin A Night blindness
Vitamin C Scurvy
Vitamin D and Calcium
Rickets
iron Anaemia
Night blindness
- Vitamin A is needed for the formation of pigment in retina which is necessary for night
vision. Therefore lack of vitamin causes night blindness
Calcium is need for the formation of bones and teeth.
Vitamin D helps the absorption of calcium.
Lack of vitamin D and calcium would result in Ricketsi.e. bones becomes soft and weak
Rickets
Anaemia- Iron is needed for the formation of haemoglobin in
red blood cells.- Lack of iron causes anaemia.
Balanced Diet- A diet which contains all the seven food
substances in right amount.
- The amount of the food substances for each individual depended on:
Sex
Occupation
Age
Physical activities
Reversion Quiz
1. How many food substances are contained in human food?
A.A.FiveFive
B.B. SixSix
C.C. SevenSeven
2. Which of the following food substances promote growth?
Reversion Quiz
A.A. ProteinsProteins
B.B. CarbohydratesCarbohydrates
C.C. FatsFats
Reversion Quiz
3. Lack of Iron will cause
A.A. RicketsRickets
B.B. AnaemiaAnaemia
C.C. ScurvyScurvy
D.D. OverweightOverweight