Hormonal
Aging is associated with a progressive dampening of circadian rhythm amplitude and a phase advance in chronotype, leading to sleep fragmentation and increased susceptibility to metabolic and neurodegenerative diseases.
As you age, your internal clock shifts earlier and weakens, causing fragmented sleep. To support health, prioritize bright light exposure in the morning to reinforce the clock, maintain consistent meal times to support peripheral clocks, and recognize that sleep changes are not just inevitable decline but potential markers of health that can be managed.
With increasing age, the circadian system undergoes significant changes that affect rhythms of behaviors, temperature regulation, and hormone release... prolonged disruptions of normal rhythms are highly detrimental to health.
Why this rating
The paper is a comprehensive review synthesizing cross-sectional and longitudinal studies across multiple species, though it notes cross-sectional limitations.
Source
The aging clock: circadian rhythms and later life
Suzanne Hood et al. · Journal of Clinical Investigation · 2017
DOI 10.1172/jci90328
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- Reduced sensitivity to light due to lens yellowing and reduced SCN neuronal coupling contributes to the desynchronization of peripheral clocks and weakened circadian output in older adults.Good
- Timed food restriction or scheduled meal timing can serve as a potent non-photic zeitgeber to resynchronize peripheral clocks and improve activity rhythms in aged individuals, potentially mitigating age-associated pathologies.Moderate
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