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Cellular Fuel Reserve

Meaning

Cellular Fuel Reserve quantifies the available stores of energy-rich molecules, primarily glycogen and triglycerides, sequestered within various cell types, particularly muscle, liver, and adipose tissue, to meet immediate and sustained metabolic demands. This reserve capacity is a critical determinant of physical endurance, metabolic flexibility, and the body’s ability to respond to acute stress or prolonged periods of fasting. Clinically, it reflects the efficiency of nutrient partitioning and energy storage pathways.