While researching your southern family history,you find that your grandmother had a sister who died fairly young.The symptoms leading up to her death included diarrhea,dermatitis,and dementia.Because the family led a poor,corn-farming existence,you suspect this relative died of

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Pellagra is caused by a deficiency of niacin (vitamin B3) and is characterized by the "three Ds": diarrhea, dermatitis, and dementia. It was common in areas where corn was a staple food, as corn is low in niacin and tryptophan.

While Researching Your Southern Family History,you Find That Your Grandmother