PRACTICE YOUR ENGLISH

Human body is actually a living machine and is like all other machines. This living machine needs fuel to supply it with energy. The fuel is provided by the food which we eat. However do we know how much we need to stay healthy?
The energy value of food is usually measured in calories. A calorie is the amount of heat which is required to raise the temperature of 1 kg of water by 1 degree C. The number of calories which people need per day varies. It depends on the activity which the people are involved in. For example; people will need more calories for standing than for sitting, people need more for running than for walking, etc.
The energy which is provided by food is in the form of three kinds of chemical substances. They are carbohydrate, protein and fat. Carbohydrate provides 8.8 calories per gram (cal/gm) of energy, protein 4.0 cal/gm and fat 8.0 cal/gm. Each food contains different proportion of these substances.These three chemical substances are all important for body staying healthy.

Report Text Notes
Report often starts discussion with brief definition or classification about the thing discussed. The first paragraph matches with the brief definition of body energy.
After brief definition or classification paragraph, report text is commonly followed by the important fact about the topic. The second and third paragraphs tell the important information about the body energy; how it comes from and what form it is available.
Report text is commonly featuring technical or scientific term. Calories, carbohydrate, protein, fat etc are some of the example.