Considerable information is available concerning the assignment of NMR spectra of urine and plasma (e.g., Ref 22-24, 38-39); this information will provide a useful guide to possible metabolites which could vary as a function of SAA intake. 2-D NMR and other techniques are available for peak identification. However, the goals of this project do not require identification of which chemical species change, only whether changes at specific frequencies can be attributed to variation in SAA intake.