Cortisol

Cortisol is the body's primary stress hormone, produced by the adrenal glands. In healthy patterns it peaks in the morning to mobilize energy and declines through the day. Chronically elevated cortisol drives visceral fat accumulation, insulin resistance, and accelerated aging.

Cortisol is produced by the adrenal cortex in response to signals from the hypothalamic-pituitary-adrenal (HPA) axis. Its acute function is adaptive: it raises blood glucose, increases heart rate, and focuses attention during perceived threat. Its diurnal rhythm — high in the morning (the cortisol awakening response), low at midnight — is a key circadian marker.

Chronic cortisol elevation, driven by psychological stress, sleep deprivation, blood sugar instability, or over-exercise, disrupts metabolism through multiple pathways. It promotes visceral (abdominal) fat storage through cortisol receptor density in deep adipose tissue. It impairs insulin sensitivity, driving a cycle of elevated blood glucose, elevated insulin, and progressive metabolic dysfunction. It degrades telomeres, measurably accelerating cellular aging.

In women, estrogen modulates cortisol sensitivity throughout the menstrual cycle. The transition into perimenopause is associated with HPA dysregulation that can produce cortisol patterns resembling chronic stress even in the absence of external stressors. Interventions with the strongest evidence for cortisol reduction include consistent Zone 2 exercise, sleep optimization, adaptogens like ashwagandha (KSM-66), mindfulness-based stress reduction, and morning light exposure to reinforce the healthy diurnal rhythm.

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