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These are people living somewhere between hunter-gatherers and subsistence farmers. Lindeberg wrote, “Cultivated tubers (mainly yam, sweet potato and taro) are staples, supplemented by fruits, leaves, [coconuts], fish, maize, tapioca and beans.” All less calorically dense foods, save for the occasional coconut. About 70 percent of their calories come from carbohydrates—so you could say the Kitavans have a high-carb diet—and they eat around 2,200 calories a day, despite having plenty of food in storage. Critically, Lindeberg reported, the Kitavans eat no processed, higher-density foods. He found no overweight Kitavans and zero indications of heart disease or evidence that any Kitavan had ever had a heart attack or stroke. The majority of people he tested were over 50 years old. A handful even reached past 90—quite a feat without modern medicine.
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Michael Easter (The Comfort Crisis: Embrace Discomfort to Reclaim Your Wild, Happy, Healthy Self)