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

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

doi:10.1093/ajcn/84.2.414

Cited by 53 publications

(36 citation statements)

References 11 publications

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“…Subjects and study design A pilot study was conducted as an adjunct to a metabolic study following methods that have been described earlier (Braun et al, 2006(Braun et al, , 2007. Owing to the objectives of the primary study, participants (n ¼ 31) were 16 boys and 15 girls of Chinese heritage between the ages of 11 and 15 years.…”

Section: Methodsmentioning

confidence: 99%

Use of technology in children’s dietary assessment

et al. 2009

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Background: Information on dietary intake provides some of the most valuable insights for mounting intervention programmes for the prevention of chronic diseases. With the growing concern about adolescent overweight, the need to accurately measure diet becomes imperative. Assessment among adolescents is problematic as this group has irregular eating patterns and they have less enthusiasm for recording food intake. Subjects/Methods: We used qualitative and quantitative techniques among adolescents to assess their preferences for dietary assessment methods. Results: Dietary assessment methods using technology, for example, a personal digital assistant (PDA) or a disposable camera, were preferred over the pen and paper food record. Conclusions: There was a strong preference for using methods that incorporate technology such as capturing images of food. This suggests that for adolescents, dietary methods that incorporate technology may improve cooperation and accuracy. Current computing technology includes higher resolution images, improved memory capacity and faster processors that allow small mobile devices to process information not previously possible. Our goal is to develop, implement and evaluate a mobile device (for example, PDA, mobile phone) food record that will translate to an accurate account of daily food and nutrient intake among adolescents. This mobile computing device will include digital images, a nutrient database and image analysis for identification and quantification of food consumption. Mobile computing devices provide a unique vehicle for collecting dietary information that reduces the burden on record keepers. Images of food can be marked with a variety of input methods that link the item for image processing and analysis to estimate the amount of food. Images before and after the foods are eaten can estimate the amount of food consumed. The initial stages and potential of this project will be described.

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Section: Methodsmentioning

confidence: 99%

Use of technology in children’s dietary assessment

et al. 2009

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“…For example, the positive calcium balance in adolescents (e.g., mean age 13 yr) is achieved by higher levels of bone formation, resorption, net bone calcium retention and absorption and lower urine calcium compared with those of young adults (e.g., mean age 22 yr) in neutral balance ( Figure 1A). Sex (13) and race (14) variations in calcium balance in adolescents have also been identified. This can be seen in black American adolescents, who have higher rates of calcium absorption, increased net skeletal calcium retention, and lower urine calcium than white American adolescents ( Figure 1B) (14).…”

Section: Calcium Distributionmentioning

confidence: 99%

Calcium Metabolism in Health and Disease

Peacock

2010

Clinical Journal of the American Society of Nephrology

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This brief review focuses on calcium balance and homeostasis and their relationship to dietary calcium intake and calcium supplementation in healthy subjects and patients with chronic kidney disease and mineral bone disorders (CKD-MBD). Calcium balance refers to the state of the calcium body stores, primarily in bone, which are largely a function of dietary intake, intestinal absorption, renal excretion, and bone remodeling. Bone calcium balance can be positive, neutral, or negative, depending on a number of factors, including growth, aging, and acquired or inherited disorders. Calcium homeostasis refers to the hormonal regulation of serum ionized calcium by parathyroid hormone, 1,25-dihydroxyvitamin D, and serum ionized calcium itself, which together regulate calcium transport at the gut, kidney, and bone. Hypercalcemia and hypocalcemia indicate serious disruption of calcium homeostasis but do not reflect calcium balance on their own. Calcium balance studies have determined the dietary and supplemental calcium requirements needed to optimize bone mass in healthy subjects. However, similar studies are needed in CKD-MBD, which disrupts both calcium balance and homeostasis, because these data in healthy subjects may not be generalizable to this patient group. Importantly, increasing evidence suggests that calcium supplementation may enhance soft tissue calcification and cardiovascular disease in CKD-MBD. Further research is needed to elucidate the risks and mechanisms of soft tissue calcification with calcium supplementation in both healthy subjects and CKD-MBD patients.

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“…This result suggests that high calcium absorption may facilitate fat absorption and contribute to weight gain, and only when a change in fecal calcium is .0.4 g/d will the fecal fat excretion increase. We previously reported the relation between fecal calcium excretion and calcium intake and observed that such a large increase in fecal calcium could occur at very high calcium intakes (ie, .1500 mg/d) (24,27) or after completion of puberty. Calcium retention is also influenced by BMI.…”

Section: Discussionmentioning

confidence: 99%

Calcium, Dairy Products, and Energy Balance in Overweight Adolescents: A Controlled Trial

2011

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Background: Dairy product and calcium consumption have been associated with modifying body fat and body weight in children and adults. Objective: In overweight adolescent boys and girls, we aimed to determine the effect of the doubling of habitual calcium intake to the recommended intake from dairy or calcium carbonate on energy balance and purported mechanisms including fecal fat excretion, macronutrient use, and parathyroid hormone suppression. Design: Twenty-five girls with a mean (6SD) BMI (in kg/m 2 ) of 33 6 5 and 17 boys with a BMI of 28 6 5, aged 12-15 y, participated in two 3-wk controlled feeding sessions that used a crossover design in random order as a summer research camp. In one session, 756 mg Ca/d was consumed; in the other session, an additional 650 mg Ca/d was provided as dairy or calcium carbonate supplements that were matched to the control in macronutrient content. Total energy and macronutrient intakes were controlled and were the same for the 2 sessions for each subject. Primary outcome measures were energy balance, fecal fat excretion, lipid oxidation, and postprandial energy expenditure. Results: There were no effects of quantity or source of calcium on energy or fat balance, despite calcium-induced increases (P ,0.01) in postprandial serum parathyroid hormone suppression. Conclusion: These data lend little evidence to support the proposed mechanisms for the relation between an increase in calcium intake from calcium carbonate or dairy and weight loss or weight maintenance in children. This trial was registered at clinicaltrials.gov as NCT00592137.

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

Abstract: The higher calcium retention in boys than in girls was attained through higher net calcium absorption and lower urinary excretion than in girls.

Cited by 53 publications

References 11 publications

Use of technology in children’s dietary assessment

Use of technology in children’s dietary assessment

Calcium Metabolism in Health and Disease

Calcium, Dairy Products, and Energy Balance in Overweight Adolescents: A Controlled Trial

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