Reversible damage found in marathon runners' brains: study

(NewsNation) — A 26.2-mile run can do some damage to the brain, according to a recent study, but the impact is temporary and reversible.Related video above: Distance runner Fiona O'Keefe breaks records en route to ParisA group of researchers studied how marathon running impacts the brain by conducting MRIs on 10 runners within two days of a run.
In a study published in the Nature Metabolism Journal on March 24, scientists observed eight men and two women and found their myelin levels "dimi