title: Urinary nitrogen output as a validity test in dietary surveys.
mesh_terms: D000328:Adult; D000368:Aged; D003951:Diagnostic Errors; D004034:Diet Surveys; D004044:Dietary Proteins / Q000032:analysis*; D005260:Female; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged; D009584:Nitrogen / Q000652:urine*; D009749:Nutrition Surveys; D011247:Pregnancy
chemical_list: D004044:Dietary Proteins; D009584:Nitrogen