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  1. 1. 1 Food and digestion - Some food comes from animals, like milk. - Other, comes from plants like fruit and bread. - We also need water and salt, that do not come from plants or animals.
  2. 2. 2 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. FOOD GROUPS - We classify food into five groups: 1.Grains gives us energy. 2.Vegetables give us vitamines. 3.Fruit gives us vitamines to be healthy.
  3. 3. 3 4.Milk gives us calcium to grow and have strong bones. 5.Meat, fish and beans gives 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 rigth. -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 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 two parts: 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 teeth cut and chew the food. - Our tongue mixes the food with saliva. - Then food goes down to the oesophgus and the stomach.
  8. 8. 8 2. In the stomach: - food is mixed with a liquid (gastric juices). 3. In the small intestine: - the food is divided into 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 transformed into faeces and expelled through the anus.