cortisol

The psychology of stress explained: acute vs chronic stress, the HPA axis, cortisol's effects on the brain, the Yerkes-Dodson curve, and how prolonged stress remodels the hippocampus.

How cortisol and the HPA axis work, why the daily cortisol rhythm matters, what chronic stress does to the body, and what the evidence says about cortisol.

How hormones work: chemical messengers, receptors, feedback loops, key hormones such as insulin and cortisol, and the endocrine disorders that follow.

How the amygdala, HPA axis, and neurotransmitters drive anxiety. Science of GAD, panic disorder, social anxiety, and modern treatments.