• Grow new cells and tissues
• Repair damaged tissues
• Provide energy
• Maintain a healthy body

• Carbohydrates
• Proteins
• Fats
• Vitamins
• Mineral salts
• Water
• Dietary Fibre

What is carbohydrates?

Carbohydrates provide body cells with an immediate source of energy they need.

Examples: bread, rice, beans, pasta, potatoes ( starch ) ; apples, bananas, grapes, raisins, chocolates and soft drinks ( sugars )

Excess carbohydrates in our body are turned into fats and stored.The fats are used for providing energy only if carbohydrate intake is low.

What are fats?

• Fats insulate our body against excessive heat loss.
• Fats are also important sources of energy that can provide twice as much energy as carbohydrates.

Examples: Butter, Margarine, Milk, Cheese, Nuts and fatty parts of meat

What are proteins?

• Proteins are the main subsatnces used for growth of new cells and the repair of damaged tissues
• They also provide energy when the body lacks carboydrates and fats

Examples: fish, meat, eggs, milk, yoghurt, cheese and beans

Before the topic of Digestion, there are some digrams you need to draw which I can't show it here.

Digestion

Why is digestion important?

Large molecules cannot pass through cell membrane p align="center">Small molecules can pass through cell membrane

Mouth

Teeth: cut, grind and break food into smaller pieces to increase surface area for enzymes to act on.

Today's lesson ended here.

To be continued.