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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, come from plants like fruit and bread. • We also need water and salt that do not come from plants or animals. FOOD GROUPS • We classify food into five groups: • Grains give us energy. • Vegetables give us vitamines.
  3. 3. 3 - Fruit gives us vitamines to be healthy. - Milk gives us calcium to grow and have strong bones. - Meat, fish and beans give us proteins 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 of 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 very important to have a good breakfast. - A good breakfast 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. THE DIGESTIVE SISTEM - Food enters our body through 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. It is made up of small intestine and large intestine. - At the end of the large intestine is the anus. THE STAGES OF DIGESTION - 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.
  8. 8. 8 -In the stomach food is mixed with gastric juices. -In the small intestine, the food is divided Into the substances our body needs. -All the useful parts of our food go from our small intestine into the blood. - Parts we can not use go into the large intestine. - They are transformed into faeces and expelled though the anus.
  9. 9. 9 - Digestion takes time (2hours). We should wait before we swim or run.