An illustration shows spikes of different types of wheat: (1) Polish wheat (2) Club wheat (3) Common bread wheat (4) Poulard wheat (5) Durum wheat (6) Spelt (7) Emmer (8) Einkorn.
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Wheat fields like this one could yield wheat with less zinc and iron in the future if they are exposed to higher levels of CO2, according to the journal Nature.
About 40 years ago wheat breeders introduced new varieties of wheat that helped farmers increase their grain yields. But scientists say those varieties aren't linked to the rise in celiac disease.
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Wheat grows in a test field at Oregon State University in Corvallis. Some scientists believe that there's a chance that genetically modified wheat found in one farmer's field in May is still in the seed supply.
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