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J Nutr. 2014 Aug;144(8):1167-73. doi: 10.3945/jn.113.188318. Epub 2014 May 28.

Dietary calcium requirements do not differ between Mexican-American boys and girls.

Author information

1
Nutrition Program, School of Public Health, University of Puerto Rico, San Juan, Puerto Rico; Departments of cristina.palacios@upr.edu.
2
Nutrition Science and.
3
Statistics, Purdue University, West Lafayette, IN; and.
4
Indiana University School of Medicine, Indianapolis, IN.

Abstract

Mexican Americans are an understudied ethnic group for determinants of bone health, although the risk of age-related osteoporosis is high in this rapidly growing sector of the U.S.

POPULATION:

Thus, the objective of the present study was to establish the dietary calcium requirements for bone health in Mexican-American adolescents by measuring calcium retention calculated from balance in response to a range of dietary calcium intakes and to determine predictors of skeletal calcium retention. Adolescents aged 12-15 y were studied twice on paired calcium intakes ranging from 600 to 2300 mg/d using randomized-order, crossover 3-wk balance studies. Skeletal calcium retention was calculated as dietary calcium intake minus calcium excreted in feces and urine over the last 2 wk of balance. A linear model was developed to explain the variation in calcium retention. Boys (n = 20) were taller and had higher lean mass, usual dietary calcium intake, bone mineral content, and serum alkaline phosphatase compared with girls, whereas girls (n = 20) had higher Tanner scores and greater fat mass. Calcium retention increased with calcium intake (P < 0.0001) and did not differ by sex (P = 0.66). In boys and girls considered together, calcium intake explained 33% of the variation in calcium retention. Serum alkaline phosphatase explained an additional 11% of the variation in calcium retention. Other variables measured, including the urine N-telopeptide of type I collagen/creatinine ratio, Tanner score, serum parathyroid hormone and 25-hydroxyvitamin D, weight, height, and body mass index, did not contribute to the variance in calcium retention. In adolescence, calcium retention in both Mexican-American boys and girls was higher than determined previously in adolescent nonHispanic white girls. This trial was registered at clinicaltrials.gov as NCT01277185.

PMID:
24872223
PMCID:
PMC4093982
DOI:
10.3945/jn.113.188318
[Indexed for MEDLINE]
Free PMC Article
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