title: Nutritional balance studies: indicators of human requirements or of adaptive mechanisms?
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D000601:Amino Acids, Essential / Q000378:metabolism*; D006801:Humans; D008722:Methods; D009584:Nitrogen / Q000378:metabolism*; D009751:Nutritional Requirements
chemical_list: D000601:Amino Acids, Essential; D009584:Nitrogen