A recent study conducted at Lund University has shed light on the effects of breastfeeding on women's bone density, revealing significant implications for the development of osteoporosis medications. The research, led by professors Kristina Åkesson and Lisa Egund, offers insights into how pregnancy and breastfeeding impact a woman’s skeletal health.

Key Findings of the Study

This research tracked 750 women over a ten-year period, starting when they were 25 years old—an age marked by optimal bone density. The central focus was to determine how pregnancy and breastfeeding affect bone density.

The researchers utilized comprehensive surveys that collected detailed reproductive health information, alongside lifestyle factors such as diet, smoking habits, and body mass index (BMI).

Impact of Pregnancy

Surprisingly, the study found that pregnancy does not adversely affect a woman's bone density. Initial post-pregnancy differences were noted, but these became negligible after three years, indicating robust skeletal resilience.

Effects of Breastfeeding

In contrast, breastfeeding was documented to cause a temporary decrease in bone density—particularly notable in the hips. Key observations included:

  • Bone Density Reduction: Women who had recently completed breastfeeding experienced an average reduction in bone density of 7%.
  • Recovery Over Time: Bone density levels were found to improve significantly over a period of two years post-breastfeeding, often exceeding pre-breastfeeding levels.

Mechanisms Behind Recovery

Professor Åkesson expressed optimism regarding the body's capability to rehabilitate bone density after breastfeeding:

“The skeleton has a fantastic ability to remineralize itself.”

This concept underlines the body's intrinsic mechanisms in recovering calcium levels, essential during lactation.

Implications for Osteoporosis Treatment

The findings from this study can contribute significantly to the understanding of osteoporosis and future drug development. Notably, the researchers have found that:

  • The recovery of bone density post-breastfeeding could potentially inform new therapeutic strategies against osteoporosis.
  • Awareness of these findings may positively influence women's perspectives on breastfeeding, emphasizing its long-term benefits for skeletal health.

Next Steps in Research

The team at Lund University plans to continue monitoring the same cohort of women in the coming decade, focusing on changes in bone density from ages 35 to 45. The intent is to ascertain whether the recovery trends observed during the initial ten years persist into later life stages.

Your Health and Nutrition

Overall, the integration of this research into clinical practice could bolster women’s health by shaping more effective prevention strategies against osteoporosis. To read the full findings, please refer to the Journal of Bone and Mineral Research.

Conclusion

Breastfeeding, while initially associated with a decrease in bone density, ultimately allows for considerable recovery and may serve as a focal point for future osteoporosis treatment avenues. Continued research will be critical in understanding these dynamics and developing proactive health strategies for women.

References

[1] Egund, L., et al. (2025). Recovery of BMD after pregnancy and breastfeeding—a 10-yr prospective observational study of 25-yr-old women, Journal of Bone and Mineral Research. DOI: 10.1093/jbmr/zjaf087.

[2] Åkesson, K. (2025). Breastfeeding's impact on bone density could boost development of osteoporosis drugs. Science X News.