Calorie is an energy measurement unit. One calorie of heat energy is required to raise one gram of water by one degree Celsius. 1,000 calories equal 1 kilocalorie (kcal), which is commonly used in measuring food energy.

Estimation of daily energy requirements for healthy individuals takes account of age, gender, body weight and activity level. Adjustment may be necessary for individuals. Individuals with low activity level should avoid consuming too much high energy food, such as fried food, sweeties, and desserts in order to prevent obesity; while teenagers, individuals with increased activity level, pregnant or lactating women should have a balanced diet to ensure adequate energy intake.


Daily Energy Requirement for Men & Female

Age12-34-67-910-1213-1516-1819-2425-4950-7475
Energy (Calories)
Male11001300180022002500280032003000270023002000
Female11001300180019002200220021002100190018001700

Pregnancy (Extra energy required): First Trimester + 100 Calories; 

                                                        Second Trimester + 300 Calories; 

                                                        Third Trimester + 300 Calories

Lactation (Extra energy required) Lactation period + 450 Calories

[E.g.: Energy Required for a 25 year-old pregnant woman during first trimester:

          1900 Calories + 100 Calories]

Surplus Energy intake of every 3500 calories leads to increase in body weight by 1 pound. When daily energy intake is larger than daily energy expenditure, and the activity level is low, obesity will be resulted.


Table: Energy Expenditure of CommonExercise

Types of ExercisesEnergy Expenditure(Energy expended by a 60 kg individual performing 30 minutes of this exercise)
Walking (Speed: 5km/ hr)135 Calories
Swimming (breaststroke, Speed: 20 mile/min)135 Calories
Badminton 155 Calories
Tennis190 Calories
Heath Dance197 Calories
Basketball (half court)248 Calories
Volleyball267 Calories
Jogging (Speed: 8km/ hr)293 Calories
Running (Speed: 10km/ hr)306 Calories



Health Eating Pyramid

Food can be classified into five main groups: cereals, meat, protein, fruits, and vegetables, and dairy products. The main nutrients provided by these foods are carbohydrates, protein, fat, minerals and vitamins. Our body obtains varying amounts of these nutrients from different types of food and then utilizes them to promote growth, help development and maintain health. Therefore, we must have a balanced diet in order to obtain sufficient and appropriate nutrients. To have a balanced diet, the principles of the food pyramid must be followed.