Exercise Hormone Irisin Shows Neuroprotective Promise in MS Research

For years, clinicians have observed that movement seems to slow the march of multiple sclerosis, yet the reason remained elusive. A study published in Nature now offers a molecular candidate: irisin, a hormone the muscles release during exercise, appears to cross into the brain and shield nerve cells from the inflammatory damage that defines MS. The discovery bridges exercise physiology and neurology in a way that reframes physical activity not merely as lifestyle advice, but as a potential source of therapeutic molecules — a reminder that the body's own chemistry may hold answers medicine has