Also, there can be inborn errors of metabolism for example, aminoaciduria.    From Wordnik.com.  [Serendip's Exchange -] Reference

Laboratory data Plasma values of essential amino acids may be decreased relative to nonessential ones, and there may be increased aminoaciduria.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

In addition, people who suffer from aminoaciduria also cannot easily change their lifestyle to rectify their body odor because aminoaciduria results from an enzyme deficiency.    From Wordnik.com.  [Serendip's Exchange -] Reference