Do synthetic gym clothes release microplastics through sweat?

What's actually in it

Synthetic gym clothes are made from plastic-based fibers like polyester, nylon, and acrylic. These materials are essentially long chains of plastic. When you wash these garments, the friction causes the fabric to break down and release tiny plastic fragments known as microplastics.

A 2026 study in Sci Rep confirms that laboratory washing conditions trigger the release of these fragmented fibers. Once these microplastics are loose, they don't just disappear. They can enter the environment and eventually make their way into your body, where they have been shown to disrupt biological functions.

What the research says

The health risks associated with microplastics are becoming clearer through peer-reviewed research. These particles are not inert; they actively interfere with your body's systems.

A 2026 study in J Agric Food Chem found that polystyrene microplastics can disrupt the gut-brain axis and impair brain synapses. Furthermore, a 2026 study in Toxicology showed that these particles induce skeletal muscle atrophy by disrupting how your body handles energy and muscle growth.

The damage extends to your organs as well. A 2026 study in J Hazard Mater found that microplastics exacerbate colitis by disrupting the gut bacteria that keep your digestive system healthy. Another 2026 study in Chem Res Toxicol identified that exposure to these plastics can cause liver injury by interfering with the way your cells clean themselves.