edamame in bowl

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First, the not-so-good news in neuroscience: According to a recent study, cognitive decline may set in as early as age 45, much sooner than previously thought. But before you start to panic, there's also reason for hope: Researchers around the globe are learning that we can build up our brains—making them bigger and sharper—simply by feeding them the right nutrients. Here, six smart foods to add to your shopping cart.