title: Reply to DJ Millward.
authors.affiliation: Department of Nutrition Science Purdue University West Lafayette, IN.
authors.forename: Minghua
authors.initials: M
authors.lastname: Tang
authors.affiliation: Department of Statistics Purdue University West Lafayette, IN.
authors.forename: George P
authors.initials: GP
authors.lastname: McCabe
authors.affiliation: Department of Pediatrics University of British Columbia Vancouver Canada.
authors.forename: Rajavel
authors.initials: R
authors.lastname: Elango
authors.affiliation: Department of Pediatrics and Nutrition Science University of Toronto Toronto Canada.
authors.forename: Paul B
authors.initials: PB
authors.lastname: Pencharz
authors.affiliation: Department of Agricultural, Food, and Nutrition Science University of Alberta Edmonton Canada.
authors.forename: Ronald O
authors.initials: RO
authors.lastname: Ball
authors.affiliation: Department of Nutrition Science Purdue University 700 West State Street West Lafayette, IN 47907 E-mail: campbellw@purdue.edu.
authors.forename: Wayne W
authors.initials: WW
authors.lastname: Campbell
mesh_terms: D000375:Aging; D004044:Dietary Proteins / Q000378:metabolism*; D005260:Female; D006801:Humans; D009751:Nutritional Requirements
chemical_list: D004044:Dietary Proteins