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A large percentage of the world's hungry people are primarily vegetarians, and even vegans, either due to religion or poverty. Although some might find that a sad fact, the reality is that a whole foods, plant-based diet can produce the world's healthiest people, as a National Geographic reporter Dan Buettner found in researching the "Blue Zones." These are the 5 places in the world "that had not only high concentrations of 100-year­olds but also clusters of people who had grown old without diseases like heart problems, obesity, cancer, or diabetes." Each location had a primarily plant-based diet and other factors.