the amount of energy requirements is varied from day to day and it is influenced by these factors such ad age, gender, activity level and state of health
we therefore need a certain amount of energy, which generally comes from food and its nutrients such as carbohydrates, fats and proteins, to satay alive and keep every thing in the body working
for example, teenagers need more energy than adults because they are still growing and the patient need more energy to fight with the infection
energy gives us the ability to do work, move around, keep warm and be active
however, we should balance the amount of energy that we use each day with the quantily of food intake, if not we will store extra as fat and will gain weight unintentionally