Presuming, that most of us have more sedentary habits due to the technological advancements, we first need to know the baseline calories our body needs for its smooth functioning. After finding our ideal body weight , the calorie requirement can be calculated as follows:
Overweight 20 Calories/kg/day
Ideal weight 30 Calories/kg/day
Underweight 40 Calories/kg/day

That is interesting. The guidelines have always suggested that women should have an intake of 2000 calories per day and men 2500 to maintain a healthy body weight.