The Influence of Circadian Rhythm on the Aging Process

Aging is a complex process that affects all parts of the body, and it happens in almost all living organisms. It is characterized by systemic functional deterioration that elevates risks for neurodegenerative, metabolic, and cardiovascular pathologies. The circadian rhythms are regulated by the suprachiasmatic nucleus (SCN) and peripheral clocks, and they play a crucial role in maintaining sleep quality, metabolism, immune function, and cognition. However, aging disrupts circadian rhythms, resulting in advanced sleep phases, reduced melatonin secretion, and desynchronization of peripheral clocks in elderly people. These disruptions would contribute to various problems, like oxidative stress, mitochondrial dysfunction, inflammation, and metabolic dysregulation, exacerbating age-related diseases, including type 2 diabetes, Alzheimers and Parkinsons disease, and cancer. Conversely, circadian misalignment accelerates aging processes by impairing cell repair and toxin cleaning and irregular hormone secretion. This creates a bidirectional relationship. Emerging therapeutic strategies, including chronotherapy, melatonin supplementation, and time-restricted feeding, show promise in restoring circadian rhythms and mitigating age-related pathologies. This review highlights the critical interplay between circadian biology and aging processes, while exploring the therapeutic potential of circadian-targeted interventions for enhancing healthy longevity and mitigating age-related pathologies.