Maybe brain freeze isn’t such a bad thing. “Use it or lose it has dominated thinking on how to protect the aging brain, and extensive research shows there are many benefits to remaining physically and mentally active as people get older. But [a new] study, published in the journal Nature, suggests more isn’t always better. Excessive activity — at least at the level of brain cells — could be harmful.” From WaPo: Excessive brain activity linked to a shorter life. These findings are probably related to stress and overexcitement in the brain, as opposed to thinking too much. But just to be safe, in the words of the great Bill Murray: “I’m pacing myself.”