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HowStuffWorks
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Agriculture, which was developed about 10,000 years ago, has been called one of mankind's greatest mistakes. Humans went from eating nutrient-rich diets of meat and vegetables to diets of grain and refined sugars. While agriculture increased the amount of food available to humans, which lengthened our lifespan and decreased deaths by starvation, this diet contains none of the vitamins or minerals that other sources of food do. Agriculture allows for mass-production and affordable food for a greater swath of people, but our palates and bodies haven't developed to metabolize such products efficiently. Farmers who maintain livestock have also had a hand in obesity, as grain-fed beef is much higher in fat than wild game.
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