Energy obtained by oxidation of 1gm of protein
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Food Safety Focus
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Energy and Protein

Food Safety Focus (29th Issue, December 2008) – Food Safety Platform
Nutrient and Health - Energy and Protein
Reported by Ms. Jacqueline FUNG, Scientific Officer,
Risk Communication Section,
Centre for Food Safety
Starting from this issue, the nutrition series will focus on selected nutrients. To begin with, we introduce the power that keeps us moving (i.e. energy) and the substance that helps us growing (i.e. protein).
Energy
If the body is a machine, then food is the fuel. Being more specific, carbohydrates, fat and protein in foods provide energy for body functions and physical activities (see table 1). They, however, do not produce the same amount of energy (see table 2). Fat produces more than two times energy per gram than either carbohydrates or protein. Metabolism in the body converts carbohydrates, protein and fat into energy. Any excess of these nutrients will be stored as fat in the body. In other words, regardless of whether it is carbohydrates, protein or fat, it will be converted into fat storage in the body if it is not used. As our body fat accumulates, our body weight increases.
Table 1
World Health Organization's Population Nutrient Intake Goals on Energy-producing Nutrients
Carbohydrates = 55-75% of energy contribution
Protein = 10-15% of energy contribution
Fat = 15-30% of energy contribution
Table 2
Energy Content of Nutrients : -
1 gram of carbohydrates = 4 kilocalories
1 gram of protein = 4 kilocalories
1 gram of fat = 9 kilocalories
In addition to carbohydrates, protein and fat, alcohol can also provide energy (1 gram alcohol = 7 kilocalories)
Note : -
Kilocalorie (kcal) and kilojoule (kJ) are measuring units for energy.
1 kilocalorie is approximately equal to 4.2 kilojoules.
Share:
Energy and Protein

Food Safety Focus (29th Issue, December 2008) – Food Safety Platform
Nutrient and Health - Energy and Protein
Reported by Ms. Jacqueline FUNG, Scientific Officer,
Risk Communication Section,
Centre for Food Safety
Starting from this issue, the nutrition series will focus on selected nutrients. To begin with, we introduce the power that keeps us moving (i.e. energy) and the substance that helps us growing (i.e. protein).
Energy
If the body is a machine, then food is the fuel. Being more specific, carbohydrates, fat and protein in foods provide energy for body functions and physical activities (see table 1). They, however, do not produce the same amount of energy (see table 2). Fat produces more than two times energy per gram than either carbohydrates or protein. Metabolism in the body converts carbohydrates, protein and fat into energy. Any excess of these nutrients will be stored as fat in the body. In other words, regardless of whether it is carbohydrates, protein or fat, it will be converted into fat storage in the body if it is not used. As our body fat accumulates, our body weight increases.
Table 1
World Health Organization's Population Nutrient Intake Goals on Energy-producing Nutrients
Carbohydrates = 55-75% of energy contribution
Protein = 10-15% of energy contribution
Fat = 15-30% of energy contribution
Table 2
Energy Content of Nutrients : -
1 gram of carbohydrates = 4 kilocalories
1 gram of protein = 4 kilocalories
1 gram of fat = 9 kilocalories
In addition to carbohydrates, protein and fat, alcohol can also provide energy (1 gram alcohol = 7 kilocalories)
Note : -
Kilocalorie (kcal) and kilojoule (kJ) are measuring units for energy.
1 kilocalorie is approximately equal to 4.2 kilojoules.
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