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Diet in midpuberty and sedentary activity in prepuberty predict peak bone mass
May-Choo Wang1, Patricia B Crawford, Mark Hudes
1Department of Nutritional Sciences and the School of Public Health, University of California, Berkeley, 94720-7360, USA. maywang@uclink.berkeley.edu
The American Journal of Clinical Nutrition
|January 24, 2003
Summary
Adequate calcium intake during midpuberty is crucial for achieving peak bone mass. Minimizing sedentary behavior in prepuberty also positively impacts young adult bone mass.
Area of Science:
- Bone health research
- Adolescent nutrition
- Growth and development
Background:
- Adolescents aged 9-18 years have a recommended daily calcium intake of 1300 mg.
- Current recommendations for adolescent calcium intake warrant further investigation.
Purpose of the Study:
- To determine the pubertal stage most critical for dietary calcium's impact on peak bone mass.
- To assess if calcium intake exceeding 1000 mg/day during adolescence correlates with higher young adult bone mass (YABM).
- To examine the influence of race on the relationship between dietary calcium and YABM, and secondarily, the impact of sedentary behavior on YABM.
Main Methods:
- A retrospective cohort study involving 693 black and white women aged 21-24 years.
- Young adult bone mass (YABM) was measured using dual-energy X-ray absorptiometry.
- Dietary calcium and sedentary activity data were collected annually over 10 years and averaged across three pubertal stages.
Main Results:
- Dietary calcium showed the strongest association with YABM during midpuberty.
- Calcium intake above 1000 mg/day was linked to higher YABM, though not consistently across all skeletal sites.
- Sedentary activity during prepuberty was inversely associated with YABM, irrespective of race.
Conclusions:
- Interventions should prioritize adequate calcium intake during midpuberty.
- Minimizing sedentary behavior in prepuberty is recommended to enhance YABM.