Bone collagen turnover slows down as humans age
In short: Researchers studying 67 individuals who died in Australia found that the rate at which bone collagen turns over decreases as people get older. By using radiocarbon tracers from mid-20th-century nuclear testing, the study observed that collagen renewal is significantly more rapid during adolescence than in later adulthood.
The study used radiocarbon measurements from femoral mid-shaft collagen to model how collagen is replaced in the body. This research is important because it helps scientists understand how much of a person's bone composition reflects their long-term diet versus recent nutrition.
The researchers compared actual radiocarbon levels to predictions from an age-dependent model. One limitation is that the study focused specifically on the femoral mid-shaft, which may not represent turnover rates in all bone types.
Why it matters: Understanding collagen turnover helps researchers interpret how bone chemistry reflects long-term dietary history.
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Sources
- Summary by Intellect · source: Research: Hedges et al. (2007). Collagen turnover in the adult femoral mid‐shaft: Modeled from anthropogenic radiocarbon tracer measurements. American Journal of Physical Anthropology.
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