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Relationship between breast-feeding and bone mineral density among Korean women in the 2010 Korea National Health and Nutrition Examination Survey

Abstract

Breast-feeding has the deleterious effect of hypoestrogenemia coupled with loss of calcium in the maternal bone mass. It is not clear whether changes in bone metabolism in lactating women lead to changes in maternal bone mineral density (BMD) over a longer period. The aim of the present study was to investigate the relationship between the duration of breast-feeding and BMD in healthy South Korean women. We analyzed data from the 2010 Korea National Health and Nutrition Examination Survey, a cross-sectional survey of Korean citizens. A total of 1342 women older than 19 years were selected for analysis. In postmenopausal women, the duration of breast-feeding per child was associated with low lumbar spine BMD after adjustment for age, body mass index, smoking, alcohol intake, physical activity, serum 25-hydroxyvitamin D level, and daily intake of calcium and calories (P < 0.05, P trend < 0.005). Prolonged breast-feeding for more than 1 year per child was associated with a deleterious effect on lumbar spine BMD compared with never breast-feeding or a shorter duration of breast-feeding (P < 0.05). These effects were not shown in premenopausal women or in femur BMD. In conclusion, the duration of breast-feeding per child is negatively correlated with lumbar spine BMD in postmenopausal women, but not in premenopausal women. Although the cause of the different results between postmenopausal and premenopausal women is not clear, our findings suggest that proper protective strategies should be recommended during prolonged breast-feeding to maintain bone health later in life.

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Acknowledgment

The authors thank Suckwon Kwon for assistance.

Conflict of interest

The authors declare that they have no conflict of interest.

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Correspondence to Chang Jin Choi.

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Yeo, U.H., Choi, C.J., Choi, W.S. et al. Relationship between breast-feeding and bone mineral density among Korean women in the 2010 Korea National Health and Nutrition Examination Survey. J Bone Miner Metab 34, 109–117 (2016). https://doi.org/10.1007/s00774-015-0649-3

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  • DOI: https://doi.org/10.1007/s00774-015-0649-3

Keywords

  • Breast-feeding
  • Bone density
  • Postmenopausal
  • Premenopausal
  • Korea National Health and Nutrition Examination Survey