Storage and release of energy-rich fuels. Green factors are responsible for storage of energy-rich fuels given in the green bowl. Red factors are relevant for release of energy-rich fuels and allocation to consumers. Storage organs are given (liver: 2,500 kJ as glycogen; muscle: 50,000 kJ as degradable protein; fat tissue as triglycerides: 500,000 kJ; values for an 85-kg person). ASD, androstenedione; Ca, calcium; DHEA, dehydroepiandrosterone; IGF-1, insulin-like growth factor-1; P, phosphorus; Vit. D, vitamin D.