Probability of Having Microplastics in Your Blood

A landmark 2022 study published in Environment International found microplastics in the blood of 77% of 22 healthy volunteers tested, and subsequent larger studies have confirmed detection rates of about 80% or higher. The most common plastics found were PET (used in drink bottles), polystyrene (used in food packaging), and polyethylene (the most common plastic globally).

Microplastics (particles smaller than 5mm) and nanoplastics (smaller than 1 micrometer) enter the body primarily through ingestion (food and water), inhalation, and skin contact. The average person is estimated to ingest about 5 grams of plastic per week (roughly the weight of a credit card), though this figure is debated. Major sources include drinking water (both tap and bottled), seafood, food packaging, and airborne particles.

The health effects of microplastics in human blood and tissues are still being studied, but emerging research suggests potential links to inflammation, oxidative stress, endocrine disruption, and cellular damage. Microplastics have been found in human placentas, lungs, livers, and stool samples. While the long-term health consequences remain uncertain, many scientists recommend reducing plastic use, avoiding microwaving food in plastic containers, and using water filtration systems as precautionary measures.