gen-explain-the-energy-balance-equation-as-you-would-to-a-capabl-d650

Explain the energy balance equation as you would to a capable student, in 3-4 sentences.

# Energy Balance Equation The energy balance equation states that **energy in minus energy out equals the change in energy stored** in a system. For your body, "energy in" comes from the food you eat (measured in calories), while "energy out" includes your basal metabolic rate, physical activity, and the thermal effect of digesting food. When energy intake exceeds energy expenditure, the excess is stored (primarily as fat), leading to weight gain; when expenditure exceeds intake, stored energy is used, leading to weight loss. This fundamental principle follows the law of conservation of energy—energy cannot be created or destroyed, only transformed or transferred.