Calcium retention in adolescent boys on a range of controlled calcium intakes

Michelle Braun, Berdine R. Martin, Mark Kern, George P. McCabe, Munro Peacock, Zhen Jiang, Connie M. Weaver

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

Background: National calcium requirements in the United States for boys are based on data from girls. On average, boys develop larger skeletons than do girls, yet it is unknown whether the additional skeletal accretion in boys requires additional dietary calcium intake. Objective: The objective was to determine calcium retention in adolescent boys in response to a range of controlled intakes and to compare the intake needed for maximal retention in boys with that needed in adolescent girls studied under the same conditions. Design: Thirty-one boys aged 12-15 y participated in 3-wk metabolic balance studies testing a range (700-2100 mg/d) of calcium intakes in a crossover study design with a 2-wk washout period. Calcium intake was varied by using a beverage fortified with calcium citrate malate. After a 1-wk equilibration period, calcium retention was calculated as dietary calcium intake minus the calcium excreted in the feces and urine over the following 2 wk. The dietary intake at which maximal calcium retention occurred was determined by using a nonlinear regression model. The results in boys were compared with those obtained in 35 adolescent girls previously studied under the same protocol. Results: Maximal calcium retention in boys was achieved at an intake of 1140 mg/d. Calcium retention was higher (by 171 ± 38 mg/d) in boys than in girls at all calcium intakes studied. Conclusion: The higher calcium retention in boys than in girls was attained through higher net calcium absorption and lower urinary excretion than in girls.

Original languageEnglish (US)
Pages (from-to)414-418
Number of pages5
JournalAmerican Journal of Clinical Nutrition
Volume84
Issue number2
DOIs
StatePublished - Aug 1 2006

Keywords

  • Adolescents
  • Boys
  • Calcium retention
  • Dietary calcium requirement
  • Metabolic balance

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Food Science

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    Braun, M., Martin, B. R., Kern, M., McCabe, G. P., Peacock, M., Jiang, Z., & Weaver, C. M. (2006). Calcium retention in adolescent boys on a range of controlled calcium intakes. American Journal of Clinical Nutrition, 84(2), 414-418. https://doi.org/10.1093/ajcn/84.1.414