Three out of four former National Football League players who died from 2008 to 2023 likely had chronic traumatic encephalopathy at death, according to new peer-reviewed research.
Story Snapshot
- Researchers estimated 74.5% prevalence of chronic traumatic encephalopathy among 2,362 deceased former players.
- The study merged confirmed brain autopsies with national death records to reduce donor bias.
- Donors with memory and behavior problems were far likelier to donate, so statisticians adjusted for that.
- The findings raise direct questions for football’s safety rules, youth play, and retirement care.
What the study found and why it matters now
Researchers from Boston University and partner institutions analyzed 2,362 former National Football League players who died between 2008 and 2023. They combined 396 brain donations with 1,966 non-donors identified through national death records. After adjusting for who donates brains and why, the model estimated that 74.5% of these men had chronic traumatic encephalopathy pathology at death. That is not a small uptick. That is a wholesale pattern across eras, positions, and career lengths, with clear implications for how the sport is played and policed.
Earlier donor-only reports found very high chronic traumatic encephalopathy rates in examined brains. Families often donate when a loved one showed memory loss, mood swings, or aggression. That creates selection bias. The new analysis measured that bias with player age, position, career length, and symptoms, then adjusted the estimate to better reflect all deceased players, not just donors. The result still lands at roughly three in four, which keeps the chronic traumatic encephalopathy signal loud even after careful corrections.
How researchers bridged the donor gap
The team used pathology from the UNITE Brain Bank and matched non-donors through the National Death Index. They contrasted donors and non-donors on factors tied to brain disease risk and to donation likelihood. They then applied statistical weights to simulate the full deceased population. One number anchors the headline: 74.5% adjusted prevalence. That single figure distills a complex method into a stark reality that passes a basic smell test and aligns with prior donor-heavy findings.
One sentence of caution is fair. Only autopsies can confirm chronic traumatic encephalopathy, so estimates for non-donors rely on modeling. But the combination of large numbers, rigorous adjustment, and consistency with prior pathology reports makes the main takeaway hard to wave off. The data do not say every veteran will develop chronic traumatic encephalopathy. They do say the disease is widespread among those who spent years in professional contact football.
The football ledger: risk, responsibility, and reform
League leaders, team owners, and players face a practical choice set. Keep improving helmets, curb head hits, and shorten off-season contact, or accept more damaged brains and the costs that follow. That is not anti-football; it is adult math. Conservative common sense says protect workers, tell the truth about risk, and hold institutions to the standards they claim to cherish. A sport that values toughness should also value brains, since judgment is the first tool of any pro.
74.5%
That's the estimated share of NFL players who died between 2008 and 2023 who had CTE, according to a new study in JAMA Network Open that corrects for brain-donation selection bias. An estimated 27.2% of all those players had dementia while alive https://t.co/6iUZPanY7D
— Bryan Walsh (@bryanrwalsh) October 29, 2026
Parents and high school coaches also have skin in the game. The most basic steps help. Teach heads-up tackling that keeps the crown out of contact. Blow the whistle early on worn-out drills. Rotate positions for young players so one kid does not absorb a season’s worth of hits at middle linebacker. Demand honest return-to-play rules and stick to them. None of that ruins football. It makes sure the boys who love it can still think clearly as men.
What comes next for players and fans
Former players need clear, simple paths to screening, benefits, and care. Many already suffer memory loss, depression, and impulse control problems that strain families and finances. Streamlined claims, less red tape, and better outreach meet the moment and respect their service to the game. Fans can press teams and the league to keep smart rules in place. Good football does not require reckless risk. It requires great coaching, clean hits, and honest accounting of harm.
Sources:
people.com, scientificamerican.com, bostonglobe.com, health.yahoo.com, footballplayershealth.harvard.edu
