Vagus nerve stimulation is a social-media sensation, promising instant stress relief. Here’s what the science really says ...

Fact checked by Jennifer Klump Key Takeaways Cortisol helps regulate stress and brain function, but chronically high levels can increase the risk of Alzheimer’s disease, Parkinson’s, and ...

Seasonal Affective Disorder is a form of depression related to changing daylight hours, sometimes known as “winter depression .because the symptoms are usually more apparent and severe during the ...