The innate biological process of coordinating and timing the initiation and execution of cellular maintenance, damage surveillance, and repair mechanisms within the body, predominantly occurring during periods of low metabolic demand. This scheduling is deeply intertwined with the circadian rhythm and is hormonally regulated, particularly by growth hormone and melatonin. Optimal scheduling is vital for tissue integrity and mitigating age-related decline.
Origin
This term integrates concepts from chronobiology and cellular senescence, emphasizing the temporal organization of restorative biological functions. The underlying science is rooted in the discovery of autophagy and DNA repair mechanisms, which are known to be upregulated during fasting states and sleep. The clinical perspective highlights the therapeutic importance of aligning lifestyle factors with these natural restorative windows.
Mechanism
The mechanism is heavily influenced by the sleep-wake cycle, where the drop in cortisol and the peak release of growth hormone, GH, and melatonin facilitate repair. GH promotes protein synthesis and tissue regeneration, while melatonin acts as a potent antioxidant and signals the onset of deep, restorative sleep. Furthermore, periods of nutrient scarcity, such as overnight fasting, activate the catabolic process of autophagy, clearing damaged cellular components.
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