title: Letter: Urinary nitrogen excretion as objective measure of dietary intake.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D004032:Diet; D004045:Dietary Services; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009584:Nitrogen / Q000378:metabolism / Q000652:urine; D009747:Nutritional Physiological Phenomena; D013997:Time Factors
chemical_list: D009584:Nitrogen