There are several factors influencing the total energy requirement of an individual, they are:

1.Basal Metabolic Rate
-People with greater the BMR require more energy.

2.Physical Activity Level
-People with greater physical activity level need more energy.

3.Age
-The advancing of age may lead to decreasing in energy needs.

4.Gender
-Males need greater amount of energy as compared to female due to greater muscle mass.

5.Metabolic Response of Foods
-Nutrient composition consumed and the amount of energy ingested are different among foods