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1 .This is Scientific American 60-Second Science. I'm Cynthia Graber. This'll just take a minute.
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2 .Diets all around the world have become increasingly similar.
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3 .That's not good news for either human health or for crop health, according to a study in the Proceedings of the National Academy of Sciences.
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4 .Scientists analyzed diet trends over the past 50 years.
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5 .Overall, people are eating more, and are getting more of those calories from meat, oil and grains.
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6 .But the diversity has gone down.
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7 .Wheat, rice and corn have gotten even more important.
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8 .Soybeans and sunflower and palm oil have also become larger players.
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9 .Meanwhile, crops such as sorgum, rye and cassava have dropped in relative importance.
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10 .The authors say the trend towards the Western diet contributes to obesity and heart disease, as well as a diminished diversity in oral and gut microbes, which is harmful to health.
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11 .Perhaps equally important, the reliance on a small group of foods puts the crops themselves at risk from diseases or climate change.
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12 .Study author Andy Jarvis says that a more diverse global food system is critical.
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13 ."This is the best way, not only to combat hunger, malnutrition, and over-nutrition,
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14 .but also to protect global food supplies against the impacts of global climate change."
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15 .Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.
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