Can microplastics from food and water cause muscle loss?

What's actually in it

Every time you eat or drink from plastic containers, you swallow microplastic particles. These tiny fragments come from food packaging, water bottles, takeout containers, and plastic-lined cans. Once swallowed, some particles cross the gut wall and enter the bloodstream. From there, they can reach organs throughout the body, including skeletal muscle, the tissue that lets you move, lift, and stay active.

What the research says

A 2026 study in Toxicology tested what happens when polystyrene microplastics reach muscle cells. The results showed two types of damage happening at once.

First, the microplastics disrupted anabolic signaling, the molecular pathway that tells muscles to grow and repair. When this signal gets blocked, muscles can't maintain themselves. They start to shrink, a process called atrophy.

Second, the microplastics damaged mitochondria, the energy generators inside each muscle cell. Muscles need enormous amounts of energy to function. When mitochondria fail, muscle cells weaken and die faster than they're replaced.

The combination of blocked growth signals and broken energy production is a recipe for muscle wasting. For older adults already at risk of sarcopenia (age-related muscle loss), this extra burden could speed up the decline.

Reducing microplastic intake won't reverse aging, but it removes one preventable source of muscle damage. Using glass or stainless steel for food and drinks, avoiding plastic-packaged hot foods, and filtering your water are the simplest steps.