iStock Frequent hits to the head, which commonly occur during football games, are known to put people at risk for later brain disease, and a new study offers a new explanation for why this might be. After a subconcussive blow to the head — one that is not severe enough to knock a person out — the body's immune response, rather than the blow itself, may be responsible for destroying brain cells, the researchers said. The researchers hypothesize that hits to the head open up the blood brain barrier — a "gate" between the blood and the brain that...
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