was ist cortisol einfach erklärt — what does this mean exactly?

Cortisol is a vital hormone produced by the adrenal glands. It's often called the 'stress hormone' because it's released in response to stress, but it also regulates metabolism, blood sugar, blood pressure, and the sleep-wake cycle. Chronically high cortisol (from ongoing stress) can lead to sleep issues, weight gain, and weakened immunity. Low cortisol (adrenal insufficiency) is rare but serious. Direct-to-consumer tests often measure cortisol in saliva or urine, but levels fluctuate throughout the day. These tests provide 'inspirational hints' only and are not diagnostic. If you suspect a problem, consult a doctor for proper blood or saliva testing and interpretation.