was ist cortisol — can a DNA test help?

Cortisol is the body's primary stress hormone, produced by the adrenal glands, regulating metabolism, inflammation, and the sleep-wake cycle. A DNA test can identify variants in genes like NR3C1 (glucocorticoid receptor), FKBP5 (cortisol sensitivity), and CRHR1 (CRH receptor), which have been linked to stress response and cortisol regulation in population studies. However, the evidence for actionable insights is weak: effect sizes are small, most findings come from GWAS rather than clinical trials, and lifestyle factors (sleep, diet, exercise, stress management) dominate cortisol levels. Consumer DNA tests often overstate their relevance. They cannot measure actual cortisol, diagnose disorders like Cushing's or adrenal insufficiency, or replace a medical workup. For personalized advice, validated biomarkers (e.g., salivary cortisol diurnal profile) and professional guidance are far more reliable. In summary, a DNA test may offer a glimpse into your genetic predisposition regarding stress regulation, but it is not a diagnostic or prescriptive tool for cortisol management.