06 Jun 2018 --- Plastic nanoparticles – which are tiny pieces of plastic less than 1 micrometer in size – could potentially contaminate food chains, ultimately affecting human health, a study conducted at the National University of Singapore (NUS) has found. The study found that such nanoplastics are easily ingested by marine life and accumulate over time. This creates a risk of transference to the human food chain. They suggest this could threaten food safety and pose health risks.