Weak bones and rapid aging cause identified - microplastics in human bones

Microplastics, the tiny plastic particles smaller than five millimeters, have emerged as one of the most pressing environmental and public health concerns of our time. Continuous research shows their presence not only in oceans, soil, and air but increasingly inside the human body. Now, a groundbreaking review reveals microplastics have been detected in human bones. Since plastics take a lot of time to decompose, these microplastics originate either from larger plastic items breaking apart or from products that start small, such as microbeads in cosmetics.

The study and its findings

A recent review led by Rodrigo B. Oliveira, coordinator of the Laboratory for Mineral and Bone Studies in Nephrology at Brazil’s State University of Campinas, gathered and analyzed 62 research papers to examine how microplastics affect bones and bone marrow.

The research uncovered microplastics in bones, cartilage, and intervertebral discs, with an average of several dozen particles per gram of bone. Cells exposed to microplastics release molecules that trigger inflammation, stimulating body restructuring. Reactive oxygen species, a type of chemical, also accumulate in bone-related cells.


The review also pointed to the impact on mesenchymal stem cells in bone marrow, which could alter their function and impair bone regeneration when exposed to certain plastics.

Effects on bone health

Microplastics can affect bone health in several ways, most notably by interfering with bone marrow stem cells and promoting the creation of osteoclasts, cells responsible for breaking down old bone tissue. Overproduction of osteoclasts leads to bone resorption, weakening the skeleton over time.

“The potential impact of microplastics on bones is the subject of scientific studies and isn’t negligible. For example, in vitro studies with bone tissue cells have shown that microplastics impair cell viability, accelerate cell aging, and alter cell differentiation, in addition to promoting inflammation,” Oliveira said, quoted by earth.com.

Animal studies suggest that microplastic exposure can accelerate bone degeneration, damaging microstructure and causing dysplasia, a condition where cells grow abnormally, resulting in weak or malformed bones and increasing the risk of fractures. The most severe effect observed in studies is stunted growth of the skeletal structure.

How microplastics reach the bones

Scientists have documented microplastic particles in human blood and various organs. One study detected common polymers such as polyethylene and polystyrene circulating in volunteers.

A 2025 study found microplastics in human brains, with higher concentrations in brain tissue than in liver or kidney, noting a steady increase in recent years. Researchers now confirm that plastic fragments have also reached skeletal tissues.

How microplastics may accelerate aging

As we age, natural hormonal changes already make bones more prone to deterioration. Exposure to microplastics adds an extra layer of cellular stress, potentially accelerating this process and turning a minor issue into a larger problem, particularly for individuals with existing bone health risks, Earth.com explains.

The International Osteoporosis Foundation (IOF) warns that hip fractures are expected to nearly double by 2050 compared to 2018.