Dietary microplastics: Occurrence, exposure and health implications

Area of Science:

• Environmental Science
• Toxicology
• Food Safety

Background:

• Plastic waste is a growing global problem, with microplastics (MPs) prevalent in aquatic environments.
• MPs, defined as particles 0.1–5 mm in diameter, have been detected in various food sources, including seafood, drinking water, and salt.
• While intestinal absorption of MPs may be limited by size, associated chemical additives could potentially cross the intestinal barrier.

Purpose of the Study:

• To review existing studies on microplastics in the food chain.
• To highlight the current gaps in knowledge regarding dietary exposure to MPs.
• To emphasize the need for robust methodologies for risk assessment.

Main Methods:

• Literature review of published studies on microplastics.
• Analysis of data on MP occurrence in dietary sources.
• Assessment of current understanding of MP toxicokinetics and toxicity.

Main Results:

• Microplastics have been confirmed in numerous food items, indicating widespread presence in the human diet.
• Limited data exists on the actual human intake and long-term health effects of MP consumption.
• Methodological challenges hinder accurate risk assessment of dietary MP exposure.

Conclusions:

• There is a critical need for improved research methodologies to accurately quantify MP occurrence and human intake.
• Further investigation into the toxicokinetics and long-term toxicity of MPs and their associated chemicals is essential.
• A comprehensive understanding of the risks associated with dietary microplastic exposure is currently lacking.