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  1. 1. 1 FOOD AND DIGESTION WE NEED FOOD TO LIVE • Food gives us the substances we need to grow and to stay healthy. • We get energy to walk or study. • Some food comes from animals like meat and milk.
  2. 2. 2 • Others, comes from plants like fruit and bread. • We also need water and salt ,that do not comes from plants or animals. FOOD GROUPS • We classify food into five groups: • 1. Grains gives us energy. • 2. Vegetables gives us vitamines.
  3. 3. 3 • 3. Fruit gives us vitamines to be healthy. • 4. Milk gives us calcium to grow and have strong bones. • 5. Meat ,fish and beans gives us energy to have strong muscles. A HEALTHY DIET • Our diet is made up of the things that we eat and drink. • We need to eat food from all the groups to stay healthy, this is a balanced diet.
  4. 4. 4 HOW MUCH FOOD DO WE NEED? • The quantity of food we need depends on how old we are and how much physical exercise we do. • When we are growing we need more of some types of food. For example, we need milk. • If we do a lot exercise, we need to eat more.
  5. 5. 5 FOOD AND MEALS • There are four meals that we eat during the day: breakfast, lunch, tea and dinner. • It is important to have a good breakfast. • A good brekfast provides the nutrients that people need to start their day off right. • A good breakfast should have milk, cereals and fruit.
  6. 6. 6 THE DIGESTIVE SYSTEM • The digestive system is made up of the following organs: the mouth, oesophagus, stomach, intestines and anus. • Food enters our body trough our mouth. • Our oesophagus is a tube between our mouth and stomach. • Our stomach is like a bag.
  7. 7. 7 • Our intestine is a long tube, made up of small intestine and large intestine. • At the end of the large intestine is the anus. THE STAGES OF DIGESTION 1. Digestion begins in the mouth. - Our theeth cut and chew the food. - Our tongue mixes the food with saliva. - Then food goes down the oesophagus and into the stomach.
  8. 8. 8 2.In the stomach. - In the stomach food is mixed with gastric juices. 3.In the small intestine. - In the small intestine the food is divided into the the substances our body needs. - All the useful parts of food go from the small intestine into the blood.
  9. 9. 9 4. Parts we cannot use go into the large intestine. -They are trasformed into faeces and expelled through the anus. - Digestion takes time (2 hours).We should wait before swim or run.