Sally Kohn: I'm curious about what one can do for, and you mentioned a lot of lifestyle have it changes that are fairly easy to do. She says starting at the age of 40, actually, the brain starts to shrink about 5% about every 10 years. But there's evidence that when people optimize their sleep, manage their stress, think about the things they're eating,  their ability of their processing speed or their brain does go up," she says.

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