Microplastics Are in Your Body. Here's What We Know.

Scientists are finding microplastics in human blood, lungs, and even placentas. We break down the latest research and what it means for your health.

In 2022, researchers published a landmark study: for the first time, microplastics had been detected in human blood. The finding sent shockwaves through the scientific community. Plastic wasn't just in our environment anymore — it was inside us.

Since then, the evidence has only mounted. Microplastics have been found in human lungs, in placentas, in breast milk, and in the digestive systems of people across every continent. A 2023 study detected microplastics in the arteries of patients undergoing surgery, raising urgent questions about cardiovascular health.

Microplastics enter our bodies through multiple pathways. We ingest them through contaminated food and water — seafood is a particularly significant source, as marine animals accumulate plastic in their tissues. We inhale them as airborne particles, shed from synthetic textiles, tires, and degrading plastic waste. We absorb them through skin contact with plastic-containing products.

The health implications are still being actively researched, but the early findings are concerning. Many plastics contain chemical additives — including phthalates, bisphenols, and flame retardants — that are known endocrine disruptors. These chemicals can interfere with hormone signaling, potentially affecting reproductive health, metabolism, and development.

Animal studies have shown that high concentrations of microplastics can cause inflammation, oxidative stress, and cellular damage. Whether the concentrations currently found in humans are sufficient to cause similar effects is a question researchers are racing to answer.

What we do know is this: the less plastic we produce and consume, the less ends up in our bodies. Reducing plastic use isn't just good for the environment — it's increasingly looking like a matter of personal health.