Microplastics are everywhere — we need to understand how they affect human health
www.nature.com
April 24, 2024, 4:46 a.m.
Although these studies did not demonstrate a causal link between the presence of MNPs and disease, they underscore the need to accelerate research on this topic. Among the most pressing questions are the amounts of MNPs that are absorbed through ingestion, inhalation or skin exposure, the amounts of MNPs that accumulate in different tissues over the lifetime of a person, and how the different characteristics of MNPs — including their chemical composition, size and shape — affect those tissues. Mechanistic studies are also needed to probe how MNPs might lead to damage, including systemic effects mediated by the immune system or the microbiome, or direct cytotoxic effects. There is also a need for study of how exposure to MNPs and its consequent effects on health may be influenced by environmental, social and economic factors.