Consider two friends who die at one hundred, both with identical life spans but very different disease spans. Grace begins a gradual health decline at fifty and by eighty requires twenty-four-hour care. Eloise begins to decline at seventy but the real health problems don’t kick in until ninety-five. All of us would prefer to have that extra twenty years of smooth sailing, followed by an extra fifteen years of happy life before disease limits our activities. I wrote this book on the premise that it is never too late to tilt the balance in our favor, to increase our health span by making
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