Could cold water swimming help treat depression?

24-year-old who reduced her medication while swimming weekly in open water was drug-and symptom-free within four months

A year ago, a 24-year-old woman with depression was given an unusual prescription by her doctor: a weekly swim in cold water.

The patient, Sarah, was filmed as part of the BBC documentary series The Doctor Who Gave Up Drugs, presented by Christoffer van Tulleken, a doctor and researcher at University College London.