Panic: Ice Water – The Biological Off SwitchTrigger the dive reflex to calm a racing heart.

From the show

Holistic Health Unpacked

Stimulating the vagus nerve with sudden cold exposure forces your body to shift from stress to safety. The mammalian dive reflex immediately slows your heart rate and activates the parasympathetic nervous system, acting as a biological brake for acute anxiety. While this physiological trick halts physical symptoms in their tracks, it serves as an emergency tool rather than a cure for underlying triggers.