Fat oxidation and its relation to serum parathyroid hormone in young women enrolled in a 1-y dairy calcium intervention

Carolyn W. Gunther, Roseann M. Lyle, Pamela A. Legowski, Julie M. James, Linda D. McCabe, George P. McCabe, Munro Peacock, Dorothy Teegarden

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

Background: Increased dietary calcium is associated with changes in body composition. One proposed mechanism is that dietary calcium increases fat oxidation, potentially via regulation of serum parathyroid hormone (PTH) concentrations. Objectives: The objectives of the study were to determine whether acute or chronic increased dairy calcium intakes alter postprandial whole-body fat oxidation and whether the increased intake is related to changes in PTH concentrations. Design: Normal-weight women aged 18-30 y were randomly assigned to a low (<800 mg/d, control; n = 10) or high (1000-1400 mg/d; n = 9) dietary calcium intake group for 1 y. Whole-body fat oxidation was assessed by measuring respiratory gas exchange after each subject consumed 2 isocaloric liquid meals containing 100 or 500 mg Ca at baseline and 1 y. Fasting serum PTH was measured at baseline and 1 y. Results: The mean 1-y change in fat oxidation was higher in the high-calcium group than in the low-calcium control group after a low-calcium meal (0.10 ± 0.05 compared with 0.005 ± 0.04 g/min; P < 0.001) and a high-calcium meal (0.06 ± 0.05 compared with 0.03 ± 0.04 g/min; P < 0.05). The 1-y change in serum log PTH was negatively associated with the 1-y change in postprandial fat oxidation after a high-calcium meal (partial r = -0.46, P < 0.04) when controlled for the1-y change in total body fat mass. Conclusions: The results suggest that a chronic diet high in dairy calcium increases whole-body fat oxidation from a meal, and increases in fasting serum PTH relate to decreases in postprandial whole-body fat oxidation.

Original languageEnglish (US)
Pages (from-to)1228-1234
Number of pages7
JournalAmerican Journal of Clinical Nutrition
Volume82
Issue number6
DOIs
StatePublished - 2005

Keywords

  • Calcium intake
  • Clinical trial
  • Dairy intake
  • Fat oxidation
  • Intervention
  • Parathyroid hormone

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Food Science

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