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Corn also contains incomplete proteins, which are perfect complements for the (different) incomplete proteins in certain other plants — most notably beans.

When you eat beans with corn complete proteins result, through a process of mutual supplementation (the beans supplement the corn, and vice versa). Some genius stumbled upon that fact and created the bean taco. (Corn and beans aren't the only combination that work this way — but, it does show that corn can be part of a healthy diet.)

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The three sisters - corn, beans and squash.