Understanding the body’s energy balance is crucial as it involves the relationship between the calories consumed through food and expenditure through daily activities and metabolism. A positive energy balance, where intake exceeds expenditure, can lead to weight gain, while a negative energy balance, where expenditure surpasses intake, results in weight loss. Achieving a healthy energy balance promotes optimal metabolic function, supports muscle mass maintenance, and prevents weight-related health issues. Awareness of this balance can guide individuals in making informed dietary and exercise choices to maintain a healthy lifestyle.