![]() Our bodies use up that energy through everyday movement, which includes everything from breathing to running. When we eat and drink, we put energy into our bodies. Our bodies need energy to keep us alive and our organs functioning normally. These values can vary depending on age, size and levels of physical activity, among other factors.Ĭheck if you're a healthy weight by using our body mass index (BMI) calculator Calories and energy balance If this continues, over time we may put on weight.Īs a guide, an average man needs around 2,500kcal (10,500kJ) a day to maintain a healthy body weight.įor an average woman, that figure is around 2,000kcal (8,400kJ) a day. When we eat and drink more calories than we use up, our bodies store the excess as body fat. The amount of energy in an item of food or drink is measured in calories.
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