A question for Darrell: Is corn sustainable?

In reading another innovative book, the author makes a scientifically backed claim that corn, in any form is nutritionally deficient and somewhat poisonous to humans unless processed with lime. What are your thoughts on this?

I am interested in the answer to this as well. I'm reading an excellent book on gardening and part of the technique involves growing high carbon grain crops to compost. One of these crops can be corn, but I'm curious about growing so much corn and how the dietary/sustainability factor functions with growing corn.

Corn is deficient is lycine, which becomes available when treated with lime, as in hominy, or mixed with legumes to provide complete protein. Almost as soon as corn was developed as a crop, native americans learened to treat it with lime or mix with complementary protein. So i do not see it as a poison or problem when used properly
A bigger question is if it is sustainable to grow. I know organic farmers that grow corn in rotations that build soil and produce good crops. Compost, legume rotations when used at the right scale can allow corn to be a valuable crop