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46 Cards in this Set

  • Front
  • Back

Why is food needed?

Source of energy


growth material for the body

Food is made up of

Chemicals called Nutrients

What are the 5 nutrients?

Carbohydrate, fats, vitamins, minerals & proteins

What is a balanced diet?

Diet that consists of:



The correct amount of each nutrient + water

Examples of carbohydates

Sugar


Starch


Cellulose (fibre)

Function of sugar

To provide energy


Function of starch

To provide energy

Cellulose (fibre)

Helps prevent constipation

Sources of sugar

Fruit, honey, milk, soft drinks

Sources of starch

Potatoes, pasta, bread

Sources of cellulose

Green vegetables & cereals

Functions of protein

For growth & repair of cells


To make muscle & hair

Sources of protein

Lean meat, egg white, soya, nuts, fish

Function of fat

To provide a store of energy


For insulation

Sources of fat

Butter, milk, cheese oils

Examples of vitamins

Vitamin C



Vitamin D

Function of vitamin C

Healthy skin & gums



Lack of vitamin C causes Scurvy

Sources of vitamin C

Citrus fruits

Function of vitamin D

To build strong bones & teeth



Lack of vitamin D causes Rickets

Sources of vitamin D

Cheese, milk, yoghurt

Examples of minerals

Iron (Fe)



Calcium

Function of iron

Needed to make red blood cells



Lack of iron causes anaemia

Sources of iron

Red meat, liver, cabbage

Function of calcium

Healthy bones & teeth

Sources of calcium

Milk, cheese, tinned salmon

Chemical used to test for starch:

Iodine solution

Colour change for starch test

Brown/yellow ---> blue-black

Chemical used to test for glucose

Benedict's solution (+heat)

Colour change for glucose test

Blue ---> purple

Chemical used to test for protein

Sodium hydroxide + copper sulfate

Colour change for protein test

Blue ---> purple

Used to test for fat

Butter rubbed on brown paper

Colour change for fat test

Translucent spot appears

Energy value:

Amount of energy that can be got from a food (measured in kilojoules)

Energy value for fats

38 kJ / g

Energy value for carbohydrates & protein

17 kJ / g

Energy value for vitamins

0 kJ / g

Recommended daily energy requirement for boys age 12-15

11, 700 kJ

Recommended daily energy requirement for girls age 12-15

9, 600 kJ

Having a balanced diet depends on:

Your gender


Your age


Physical activity

If you do not have a balanced diet you many suffer from:

Malnutrition

How many helpings of cereals should we have per day?

At least six

How many helpings of fruit/veg should we have per day?

3 of each

How many helpings of dairy products should we have per day?

2-3

How many helpings of meat,fish,nuts or eggs should we have per day?

2-3

How many helpings of fats, oils & sweets should we have per day?

0-3