The foods you eat provide the energy your body needs to function. Just like you need to put fuel in your car or recharge your cell phone battery, your body needs to be fed energy-providing foods every day.The main form of energy for your body is carbohydrates.
The amount of chemical energy stored in food is called its calorific value which is usually measured in calories (cal) or Kilocalories (kcal). Calorific values also often measured in joules (J) or kilojoules(kJ).
1 calorie = 4.2 joule
1 kilocalorie = 4.2 kilojoule
Good nutrition means getting the calories we need for energy and the nutrients we need for proper growth and other living activities. Variety, balance, and moderation are keys to good nutrition.
Variety means that you must include many different foods from each level of the Food Pyramid because no single food can supply all of the nutrients that your growing body needs on a daily basis.
Balance means that you must eat the right amounts of foods from all levels of the Food Pyramid each day. This way you will get all the calories and nutrients you need for proper growth and development.
Moderation means that you are careful not to eat too much of any one type of food.
Staying healthy includes a balanced diet, staying clean, getting plenty of exercise as well as keeping your heart strong and free of drugs. People who practice good nutrition, hygiene and exercise patterns develop a lifetime of habits that will keep them healthy for many years. Especially when they are older!