Micro- and nanoplastic (MNP) particles are constantly formed through plastic fragmentation by sunlight, friction, or oxidation. MNPs potentialize health risks when entering the human body by ingestion, infusion, inhalation, and skin absorption. Still, the translocation among intracellular compartments must also be considered because MNPs can reach the circulatory system and be found in virtually all body fluids, tissues, and organs, potentially causing significant health impacts. The ability of MNPs to interact with macromolecules and cause damage to intracellular structures results in several physiopathological conditions, such as inflammation, oxidative imbalance, apoptosis, and carcinogenesis. One major challenge in MNP research is the development of reliable detection and quantification methods and effective sample separation processes. Although there is evidence directly linking MNPs to heart disease, the same cannot be said for diseases such as cancer, respiratory conditions, and reproductive system disorders. Therefore, the impact of MNPs on human health was examined, and a careful evaluation of their effects was carried out. We reviewed the extensive scientific literature from the past years, focusing on exposure, aging, interactions, and effects on entering MNPs into human metabolism and the physiological systems, which makes these particles particularly hazardous.
Souza et al. (2025) studied this question.