“Most people,” he continued, “are full of energy and enthusiasm in their youth, but then during middle age they lapse into a slow, downhill slide that they pretend not to notice. After all, their friends are slowing down and their kids are active, so they spend more and more time sitting around and eating the foods that taste good. “Before long, they begin to have nagging complaints and chronic problems such as digestive difficulties or skin irritations that they write off as just age, and then one day they get a serious illness that won’t go away. Usually they go to a doctor who does not
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