A deficiency of riboflavin can be primary - poor vitamin sources in one's daily diet - or secondary, which may be a result of conditions that affect absorption in the intestine, the body not being able to use the vitamin, or an increase in the excretion of the vitamin from the body.
Substantial evidence means more than a mere scintilla. It means such relevant evidence as a reasonable mind might accept as adequate to support a conclusion.. Richardson v. Perales, 402 U.S. 389, 401 (1971).
exists and is an alternate of . Textual evidence means that the writer uses either direct quotations or paraphrased material from a source in order to support an argument or illustrate a point. All textual evidence needs to be properly cited. That means give credit to the author(s) by using proper documentation.