Emerging evidence reveals that bone tissue functions far beyond structural support—it actively regulates glucose metabolism through mechanical loading responses. When bones experience stress from weight-bearing or resistance exercise, they trigger the release of osteocalcin, a hormone secreted by bone-forming cells that enhances insulin sensitivity and improves glucose uptake by skeletal muscle. This discovery establishes a direct feedback loop connecting movement, bone turnover, and metabolic health. The research demonstrates that resistance training and weight-bearing exercise activate this bone–pancreas–muscle pathway more effectively than aerobic activity alone. While the mechanisms are well-established in animal models, growing human correlational data increasingly support this integrated metabolic framework. Understanding bones as endocrine organs reshapes how clinicians and patients approach both skeletal and metabolic health management.
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