Microplastics, the pervasive particles found in everything from oceans to human tissues, may be contributing to bone degeneration, according to a new scientific review. Researchers in Brazil analyzed over 60 in vitro and animal studies and found that these particles can disrupt the natural process of bone remodeling, potentially leading to weaker bones and an increased risk of fractures.
The review, published in the journal Osteoporosis International, was led by Rodrigo Bueno de Oliveira, coordinator of the Laboratory for Mineral and Bone Studies in Nephrology at the State University of Campinas. The team's analysis indicates that microplastics can promote the formation of osteoclasts, cells that break down bone tissue. In a healthy cycle, this breakdown is balanced by the creation of new bone, but the researchers found that microplastics also impair the body's ability to regenerate, tipping the scale toward net bone loss.
This imbalance, the researchers warn, could lead to skeletal weakening, deformities, and a higher susceptibility to fractures. In animal studies, the effects were severe enough to interrupt skeletal growth entirely. Oliveira noted that the potential impact of microplastics on bones is a subject of active scientific investigation and is not negligible.
The review also identified other negative health effects associated with microplastic exposure, including reduced white blood cell counts and disruptions to gut microbiota. These findings add to a growing body of evidence linking microplastics to a range of health issues, from mental decline to cardiovascular problems, although direct causation in humans remains unproven.
Potential Link to Osteoporosis
The researchers suggest that if the link holds, microplastics could be a contributing factor to the rising global incidence of osteoporosis, a condition characterized by brittle bones. According to the International Osteoporosis Foundation, one in three women and one in five men over age 50 will experience an osteoporosis-related fracture in their lifetime. Projections indicate these rates could increase by 32 percent by 2050, driven largely by an aging population.
Oliveira emphasized that there is a gap in knowledge regarding how microplastics influence the development of such diseases. His team's next step is to test the effects of microplastics on the strength of rodent femurs, aiming to generate evidence that could position microplastics as a controllable environmental risk factor.
While the ubiquity of microplastics makes them a plausible culprit, experts caution that more research is needed to establish a definitive link. The current study, however, provides a compelling rationale for further investigation into how these particles affect human health.
