practice of cooking corn with lime and serving it with beans, like the Asian practice of fermenting soy and serving it with rice, turn out to render these plant species much more nutritious than they otherwise would be. When not fermented, soy contains an antitrypsin factor that blocks the absorption of protein, rendering the bean indigestible; unless corn is cooked with an alkali like lime its niacin is unavailable, leading to the nutritional deficiency called pellagra. Corn and beans each lack an essential amino acid (lysine and methionine, respectively); eat them together and the proper
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