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This is Scientific American 60-Second Science. I'm Cynthia Graber. This'll just take a minute.

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Diets all around the world have become increasingly similar.

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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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Scientists analyzed diet trends over the past 50 years.

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Overall, people are eating more, and are getting more of those calories from meat, oil and grains.

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But the diversity has gone down.

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Wheat, rice and corn have gotten even more important.

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Soybeans and sunflower and palm oil have also become larger players.

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Meanwhile, crops such as sorgum, rye and cassava have dropped in relative importance.

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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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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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Study author Andy Jarvis says that a more diverse global food system is critical.

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"This is the best way, not only to combat hunger, malnutrition, and over-nutrition,

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but also to protect global food supplies against the impacts of global climate change."

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Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.

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