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  1. 1. 1 WE NEED FOOD TO LIVE - Food gives us the substances we need to grow and to stay healthy. - We get energy we need to walk or study.
  2. 2. 2 - Some food comes from animals like meat and milk. - Others, come from plants, like fruit and bread. - We also need water and salt, that do not come from plants or animals. FOOD GRUPS – We classify food into five grups: 1. Grains gives us energy. 2. Vegatables 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, beans and fish give us proteins. A HEALTHY DIET • Our diet is made up of the things that we eat and drink. • We need to eat food from all the grups 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 of exercise we need to eat more.
  5. 5. 5 • 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 breakfast shoud 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 through our mouth. • Our oesophagus is a tube between our mouth and stomach.
  7. 7. 7 • Our stomach is a like a bag. • Our intestine is a long tube made of small intestine and large intestine. • At the end of the large intestine is the anus.
  8. 8. 8 The stages of digestion 1. Digestion begins in the mouth: • Our teeth cut and chew the food. • Our tongue mixes the food with saliva. • Then food goes down the oesophagus and into the stomach. 2. In the stomach food is mixed with gastric juices.
  9. 9. 9 3. In the small intestine • The food is divided into the substances our body needs. • All the useful parts of our food go from the small intestine into the blood. 4. Parts we cannot use go into the large intestine. • They are transformed into faeces and expelled through the anus. • Digestion takes time (2 hours) We should wait before we swim or run.