secondary pellagra

sec·on·dar·y pel·lag·ra

pellagra resulting from any morbid condition that impairs nutrition by increasing the requirement or reducing the available supply of vitamins.
Farlex Partner Medical Dictionary © Farlex 2012
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Secondary pellagra is due to processes interfering with metabolism or absorption of niacin or tryptophan.
Secondary pellagra occurs when there is enough niacin in the diet but something prevents its absorption and processing.
Despite sufficient dietary Niacin, Secondary Pellagra may be caused by a problem in Niacin absorption or metabolism.