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Alapanyagcsere-sebesség, often referred to as Basal Metabolic Rate (BMR), represents the minimal amount of energy your body needs to perform essential life-sustaining functions while at rest. These functions include breathing, circulation, cell production, and nutrient processing. It's the energy expenditure that occurs in a completely relaxed state, typically measured in the morning after an overnight fast and before any physical activity.

Several factors influence an individual's BMR. Age is a significant determinant, with BMR generally decreasing as people get older. Body composition plays a crucial role; individuals with more muscle mass tend to have a higher BMR than those with more body fat, as muscle tissue is metabolically more active. Sex also impacts BMR, with men typically having a higher BMR than women due to generally greater muscle mass and body size. Genetics can also play a part in individual variations.

Environmental factors, such as ambient temperature, can also slightly affect BMR. For instance, exposure to extreme cold can increase BMR as the body works to maintain its core temperature. While BMR is measured under specific resting conditions, it forms the foundation for calculating total daily energy expenditure, which also includes energy used for physical activity and the thermic effect of food. Understanding BMR can be helpful in managing weight and overall health.