Balanced diet and Caloric Value

Balanced diet and Caloric Value

Balanced diet

• Malnutrition

• Pinggan sihat Malaysia

Calorific value

Calorific value (or energy value) of food is the

amount of energy that is released from the complete oxidation or combustion of 1 g of that food.

Unit for Calorific Value

Energy that is released from the oxidation or combustion of food is normally measured in calorie (cal), kilocalorie (kcal), joule (J) or kilojoule (kJ).

What is the S.I. unit for energy?

The S.I. unit for calorific value is

joule per kilogram (J kg–1).

1 calorie (cal) = 4.2 joules (J)

1 kilocalorie (kcal) = 4 200 joules (J)

1 kilocalorie (kcal) = 4.2 kilojoules (kJ)

Measuring the Calorific Value of Food

The calorific value of food can be measured

by using a special apparatus called bomb calorimeter

Table 2.1 shows the calorific value of carbohydrate, fat and protein measured using a bomb calorimeter.

Different Kinds of Food and Estimation of Calorific Values

The calorific value of food is determined by the quantity of carbohydrate, protein and fat content in the food.

For example, observe Figure 2.3 and Table 2.2 which show several examples of food and their estimated calorific values.

Open Ended

Which of the sandwiches, A, B and

C, is the healthiest choice? Explain

your answer.

Effects of Total Calories Intake

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