Can chronic psychological stress and HPA activation reduce DHEA/DHEA-S relative to cortisol even when morning cortisol is normal?

Chronic psychological stress and age-related changes significantly alter the balance of adrenal hormones, often leading to a disproportionate decline in anabolic precursors like DHEA/DHEA-S relative to the catabolic hormone cortisol. This shift is well-supported by clinical evidence, particularly in the context of aging and long-term stress exposure.

Clinical and effectiveness evidence

Research indicates that chronic stress results in a characteristic dysregulation of the HPA axis, frequently measured by an increased cortisol-to-DHEA-S ratio.

• Hormonal Dissociation: Studies in aging and psychiatric populations demonstrate that DHEA-S levels often decline while cortisol levels remain stable or elevated. In a 68-year-old female, this is particularly relevant as DHEA-S levels naturally fall by 80–90% from youthful peaks, a process known as adrenopause.
• Predictive Value: The cortisol-to-DHEA ratio is often a more sensitive biomarker for health outcomes than either hormone alone. High ratios are associated with increased risks of frailty, cognitive decline, immune dysfunction, and metabolic imbalances.
• Normal Cortisol Observations: Clinical data confirm that morning cortisol levels can remain within "normal" reference ranges even when DHEA-S production is severely diminished. This occurs because the two hormones are produced in different functional zones of the adrenal cortex that can age or respond to stress at different rates.

Mechanistic explanations

The shift away from anabolic steroid production is driven by both structural changes in the adrenal glands and enzymatic redirection of hormone precursors.

• Zonal Atrophy: Cortisol is produced in the zona fasciculata, which tends to remain functional throughout the lifespan. Conversely, DHEA-S is produced in the zona reticularis, which undergoes selective atrophy with age and chronic stress, leading to reduced androgen output.
• The Glucocorticoid Shunt: While the popular term "pregnenolone steal" is simplified, a "glucocorticoid shunt" does occur at the enzymatic level. Sustained HPA activation can reduce the activity of the enzyme 17,20-lyase (part of the CYP17A1 complex). This redirecting of pregnenolone favors the glucocorticoid pathway (cortisol) over the androgenic pathway (DHEA), prioritizing survival-related stress responses over metabolic repair and anabolic functions.
• Anabolic/Catabolic Imbalance: Because DHEA is the primary precursor for more potent androgens like testosterone, its reduction signals a systemic shift from an anabolic state (focused on tissue repair and neuroprotection) to a catabolic state (associated with muscle wasting and insulin resistance).

Bottom line

Chronic stress and HPA activation drive a shift toward catabolic dominance by reducing DHEA production relative to cortisol. This hormonal imbalance can exist even when morning cortisol appears normal, making the cortisol-to-DHEA ratio a critical metric for assessing physiological resilience and metabolic health in older adults.