<prompt> Niacin deficiency in a maize-eating population is due to-High TryptophanHigh lsoleucineHigh leucineHigh Phenylalanine  <response>: Ans. is c i.e., High Leucine Excess of Leucine interferes in conversion of Tryptophan into Niacin, and aggravates the pallagrogenic action of inake. 