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Football is dangerous. Parents are finally steering their kids away from it.

A new study found at least one in four former NFL players had CTE at their time of death.

When the NFL season kicks off next month, millions of Americans will gather around their televisions to watch athletes of comic book proportions crash into each other at breathtaking speeds. Inevitably, those players’ heads will smash into each other, leaving them dazed on the field. And according to a major new study, these repeated head-on collisions may eventually lead to a degenerative brain disease for many — if not most — of the players long after they’ve left the field.

For years now, America has been reckoning with the tension between its love for football and the growing evidence of its dangers. Those concerns can be boiled down to three letters: CTE, or chronic traumatic encephalopathy, which is the progressive brain disease that can lead to dementia, depression, suicide, and other serious mental health problems.

One major question over the past 20 years has been: Exactly how often does playing football lead to CTE? What are the risks for peewee players versus pros? How quickly does the brain deteriorate once the disease takes hold? And new research, published this week in the British Medical Journal, has provided us with some staggering answers. After analyzing the death records for hundreds of former NFL players, the co-authors concluded that at least 25 percent of the former players who........

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