CTE Found in Nearly All Donated NFL Player Brains, Study Finds

A shocking study by Boston University researcher Dr. Ann Mckeen on football players and the degenerative brain disease CTE (chronic traumatic encephalopathy) reveals a striking result among NFL players.

The study examined the brains of 202 deceased football players and found that 110 of the 111 brains of former NFL players had CTE. The results were published in the Journal of the American Medical Association on Tuesday (July 25).

“It is no longer debatable whether or not there is a problem in football—there is a problem,” Dr. McKee said, according to the New York Times.

The brains were donated by families of former NFL players who showed signs of the disease. The study was not conducted on a set of random former NFL players, and Dr. McKee notes “tremendous selection bias” in the samples.

CTE can cause impaired judgment, aggression, memory loss, and depression. It can only be diagnosed postmortem.

The study examined players as young as 23 years old and as old as 89. The brains were also from all player positions including 44 linemen, 10 linebackers, 17 defensive backs, and 7 quarterbacks.

Will Smith’s 2015 movie Concussion chronicled the discovery of CTE to football.