You’re lying on an operating table. A doctor injects a milky white liquid into your veins. Within a minute, your breathing slows, your face relaxes, and you remain limp when asked to squeeze a hand.

Correspondence to Dr Barbara J Jefferis, Department of Primary Care and Population Health, University College London, London NW3 2PF, UK; b.jefferis{at}ucl.ac.uk Objectives To understand how ...

Cortisol is a stress hormone that helps in the short term, but chronically high levels may raise chronic disease risk, weight gain, and sleep issues. To naturally lower cortisol levels, focus on sleep ...