Cortisol Dynamics and Cognitive Function in Aging Populations

Cortisol, the principal glucocorticoid in humans, orchestrates the body’s response to stress and exhibits a characteristic diurnal rhythm that may become blunted or elevated with advancing age. In older adults, sustained high cortisol levels have been linked to hippocampal atrophy, impaired memory consolidation and executive dysfunction. Age-related alterations in glucocorticoid receptor sensitivity and feedback regulation of the hypothalamic–pituitary–adrenal (HPA) axis can exacerbate the neurotoxic effects of cortisol on limbic structures. Concurrently, sex and hormonal status modulate cortisol’s impact on amyloid processing and metabolic activity in cortical regions vulnerable to neurodegeneration. Together, these factors contribute to individual variability in cognitive ageing and the emergence of Alzheimer’s-type pathology. Understanding cortisol dynamics in later life holds promise for early identification of at-risk individuals and for the development of interventions—ranging from lifestyle modifications to selective receptor modulators—that aim to preserve cognitive resilience and forestall decline.

Research from Nature Portfolio

Recent studies have examined sex-specific associations between serum cortisol and multimodal brain biomarkers in cognitively normal midlife adults at elevated Alzheimer’s risk. Elevated cortisol correlated with reduced global and regional brain volumes and with lower frontal glucose metabolism, alongside increased β-amyloid accumulation in regions prone to early pathology. Notably, post-menopausal women demonstrated stronger cortisol–amyloid relationships and more pronounced metabolic deficits, whereas men showed greater sensitivity of grey matter volume and high-energy phosphate ratios to cortisol levels. Behaviourally, higher cortisol predicted poorer delayed recall in men but not in women. These findings highlight differential neurophysiological responses to stress across sexes and suggest that tailored stress-reduction strategies may augment existing preventative approaches for dementia.

Cortisol Dynamics and Cognitive Function in Aging Populations publication trend

The graph below shows the total number of articles in cortisol dynamics and cognitive function in aging populations across all publications each year (not limited to Nature Index journals).

Technical terms

Cortisol: A steroid hormone released by the adrenal cortex in response to HPA axis activation; central to stress adaptation and energy metabolism.

Hypothalamic–pituitary–adrenal (HPA) axis: The neuroendocrine system regulating cortisol secretion through interactions among the hypothalamus, pituitary gland and adrenal glands.

Hippocampal volume: The measurable size of the hippocampus on neuroimaging, often used as an indicator of memory-related brain health in ageing and disease.

β-Amyloid load: The accumulation of amyloid-β peptides in brain tissue, a hallmark of Alzheimer’s pathology assessed via imaging or fluid biomarkers.

Glucocorticoid receptor (GR): A nuclear receptor that mediates cellular responses to cortisol, influencing gene transcription and neural plasticity.

References

1. Elevated serum cortisol associated with early‐detected increase of brain amyloid deposition in Alzheimer's disease imaging biomarkers among menopausal women: The Framingham Heart Study. Alzheimer's & Dementia (2025).
2. An Interaction between Brain-Derived Neurotrophic Factor and Stress-Related Glucocorticoids in the Pathophysiology of Alzheimer’s Disease. International Journal of Molecular Sciences (2024).
3. Serum cortisol is negatively related to hippocampal volume, brain structure, and memory performance in healthy aging and Alzheimer’s disease. Frontiers in Aging Neuroscience (2023).
4. Sex-specific associations of serum cortisol with brain biomarkers of Alzheimer’s risk. Scientific Reports (2024).