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课件网) Unit8 Lesson2 Healthy Living Content Connection -Science Listen and read. What activities are good or bad for your body What Is a Calorie What are calories Are they important A calorie is a measure of the energy you get from food. Some foods are high in calories, and other foods aren’t. Your body needs a certain number of calories to do all the things you do every day. But if you eat more calories than your body needs, you put on too much weight. Lots of activity and exercise burns a lot of calories. Very little activity or exercise doesn’t burn a lot of calories. Why is being active good for us It helps our hearts stay healthy. It makes our bones strong, and it creates muscles. Being active is really important for young and old people. Activities that use lots of energy are best. Dancing is really good for your body. Riding a bike and swimming are also good for your body. But watching TV or playing video games are bad for your health if you do them too much. That’s because you sit in the same place to do them. Food Labels They also tell you the nutritional value of the food. Food labels tell you how much energy is stored in the food. Energy Drink Typical Values Per 250ml serving Energy 373kJ Fat - of which saturates 0g 0g Carbohydrates - of which sugars 21.0g 11.3g Protein 0g Salt 0.14g Different foods store different amounts of energy. Both the amount of energy in the store and the nutritional value of the food are important considerations in a healthy balanced diet. Food Labels Use the food labels from drinks, snacks and breakfast cereals to complete the questions on the worksheet. You need different amounts of energy depending on what you do each day. Your body transfers energy when it keeps you warm, moves food through your gut, breathes, thinks, moves and talks. Activity Energy Transferred (kJ) per Minute sleeping 5 sitting 6 standing 7 walking 13 housework 14 washing, dressing 15 cycling 25 running 60 swimming 73 football 86 A person who cycles to work and back each day will transfer more energy on the journey than a person that drives there and back each day. A person that lives in a cold climate will transfer more energy during the day to keep warm than a person that lives in a warm climate. Energy Requirements Energy Balance If a person takes in more energy than they need: The energy will be stored in the chemical bonds that hold together fat molecules. The mass of the person will increase. If a person takes in less energy than they need: The fat molecules will be broken down to release energy from the chemical bonds. The mass of the person will decrease. An adult should take in just the energy that they need for the activities that they do. Energy Balance Pick one person and use the Energy in Food Table to plan what they could eat over the day to take in just the energy that they need. You should include food for a morning, midday and evening meal, along with any snack ... ...
