3.1 What do you eat?

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

Welcome everyone 

 Think about...

• Take off your coat, hat off.
• Mobile in the phone bag (on silent).
• Book (laptop) + notebook, pen on the table. Bag on the floor.
• Sit in your own place!
• You can eat and drink in the canteen.
• 5 minutes.

schedule 

• Repetition 3.1             10 min.
• Explanation 3.2         10 min.
• Doing Excercises        
• Closing                           5 min. 

Learning goals 

You will know..

• what a joule/callorie is.
• wicht nutreints there are.
• wich nutrients whe need to break down. 

Energy 

• All of your body’s activities require energy.
• Energy can be measured in joules or calories
• On food lables you van often find the amount of energy in 100 gram of that food, measured in kilo joule or kilo calorie.
• Example

- Glass of water = 0 kj

- Biscuit = 100 kl

- Chocolate bar = 1000 kj

How much Energy? 

• The higher your activity level, the more energy 

you need.

• How much energy you need depends on: 

- your gender

- your heigt 

- your activity 

Why do we need food?

• To supply us with fuel for energy.
  
• To provide materials for growth and repair of tissues
  
• To help fight disease and keep our bodies healthy.

• Nutrients (voedingsstoffen) = substances in food that provide your body with energy and other materials.

The 6 nutrients have 4 different functions

Building blocks

Fuels (energy)

Reserves

Protective substances 

building blocks

Growth and development

repairing wounds 

making new cells and tissues

Proteins                  Water
Carbohydrates     Minerals
Fats                            Vitamins

Fuels

In every cell is respiration. 

Energy, movement, warmth

Proteins
Carbohydrates
Fats

Reserves

Nutrients can be stored up in the body

Carbohydrates

Fats

Nutrients

- Proteins (eiwitten)

- Carbohydrates (koolhydraten)

- Fibre

- Fats (vetten)

- Water 

- Minerals (mineralen)

- Vitamins (vitamines)

Carbohydrates 

• Carbohydrates are the main source of energy in your body.
  

The three types of carbohydrates:

- Sugar

- Starch (zetmeel)

- Fibre (vezels)--> (complex carbohydrate) Is found in the cell walls of plant cells. You cannot break down fibre. It helps your digestive system working smoothly.

Carbohydrates 

• Simple carbohydrates
  

    - Sugar

    - It consists of small particles that van easily enter your bloodstream and reach your cells.

• Complex corbohydrates
  

    - Starch

    - It is made up of long chains of many simple        carbohydrates. 

-    These chains are too arge to enter                             your bloodstream. They have to be                           broken down into sugars first.

Proteins 

The body needs proteins to grow and replace/repair cells.

Too much protein/too little carbs--> body will use protein  as feul (energy).

Fats  

A source of energy and storage units for energy. 

three main types:

- saturated: solid at roomtemp. can cause heart problems.

- unsaturated: liquid, healthyer 

- trans: special type of unsaturated--> chemically alterd to sty liquid. Bad for you

Vitamins  and Minerals  

Needed for growth and protection against disease. 

• Sometimes work together
• minaral zinc helps body to obtain 

vitamin C for example. 

Scheurbuik

Scurvy :in navigators 'pirates' due to lack of vitamin C

Solution: Take fresh lemons/oranges with you on the trip.

 Water   

• Water is an essential nutrient at every age.
• Optimal hydration is a key component for good health.
• Water accounts for about 60% of an adult's body weight. 
• We drink fluids when we feel thirst, the major signal alerting us when our body runs low on water.

Closing 

• fill in a survey for me.