Yes, indians of the american southwest use a lime solution for their corn meal to avoid this problem. >If I remember my biochemistry right, the reason pellagra occurs in groups >who consume a lot of corn is that the corn is their major source of >protein and corn is deficient in tryptophan. One of the more minor >metabolic pathways for tryptophan leads to nicotinic acid (a form of >niacin) and is capable of supplying about half the daily requirement of >niacin (note that "vitamin" doesn't imply "can't be synthesized by the >body at all" but merely "can't be synthesized by the body in adequate >amounts"). People whose diet has corn as its major protein source >generally don't consume many dietary sources of niacin as such. In >short, they're malnourished. Increasing the amount of corn in the diet >of a person who isn't malnourished will *not* cause a niacin deficiency.