Cortisol Receptor Sensitivity
Same cortisol level, very different felt experience. High receptor sensitivity means stress hits harder even when cortisol is "normal." This explains why some people thrive in chaos while others burn out—and it's not about being weak. It's about wiring.
What this measures
How your DNA shapes cortisol receptor sensitivity.
NR3C1 codes for the glucocorticoid receptor — the receptor that translates circulating cortisol into the downstream effects on inflammation, glucose, mood, and immune function. The same blood-level cortisol can produce very different tissue effects depending on how sensitive the receptor is. Several common NR3C1 variants shift receptor sensitivity up or down.
Carriers of NR3C1 high-sensitivity variants (the N363S "BclI" variant) are associated with stronger cortisol effect per unit circulating — including higher visceral fat tendency, faster bone-density loss under stress, and greater metabolic impact from chronic stress. Carriers of NR3C1 reduced-sensitivity variants ("glucocorticoid resistance") are associated with the opposite pattern: blunted response, potentially elevated baseline cortisol to compensate, and altered inflammatory regulation.
Sleep, exercise, and nutrient status (particularly magnesium, B vitamins, vitamin C) all influence receptor sensitivity. Chronic inflammation can induce a form of acquired glucocorticoid resistance. Sex hormones interact with NR3C1 expression — estrogen and testosterone both shift receptor responsiveness. Mindfulness and stress-recovery practices specifically alter receptor function in some carriers.
Two clients with identical cortisol labs can experience completely different metabolic and mood consequences. Which NR3C1 variant you carry decides whether cortisol numbers tell the full story or whether the tissue-level effect — and the lifestyle inputs that modulate it — sit underneath what bloodwork shows.
Cortisol Receptor Sensitivity is one specific finding in this system. Your Genomic Lifestyle Optimization Report shows where your variants place you on the hormones spectrum — and what you can do about it: it renders as a dark card with a color marker calibrated to your variants, opening with the gene mechanism and closing with a practical, mechanism-led recommendation.
Want to see what a real Mosaic dark card looks like? Walk through a sample report →
In context
Cortisol & Stress: the 2-insight cluster.
Cortisol Receptor Sensitivity is one finding in a tightly-related cluster. Mosaic sequences the other 1 alongside it so you see the whole biology — not an isolated data point.
Questions people ask
About Cortisol Receptor Sensitivity.
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