These are the progressive, inevitable changes in the structure and function of bodily systems that occur over the lifespan. Such shifts encompass declines in organ reserve and efficiency, impacting metabolic rate, immune response, and tissue regeneration capacity. Understanding these changes is critical for proactive health and longevity planning.
Origin
The concept is derived from the field of gerontology and human physiology, focusing on the systemic effects of biological aging. “Age-related” specifies the causality linked to advancing chronological time, while “physiological shifts” refers to the measurable alterations in normal bodily function.
Mechanism
Key drivers include cellular senescence, telomere shortening, and accumulation of molecular damage, leading to reduced cellular function. Hormonal changes, such as declining sex hormone and growth hormone levels, significantly contribute to the remodeling of body composition and decreased homeostatic resilience. These interconnected factors ultimately diminish the body’s ability to adapt to internal and external stressors.
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