We could be swallowing more than 100 tiny plastic particles with every main meal, a Heriot-Watt study has revealed.
The plastic, which can come from soft furnishings and synthetic fabrics, gets into household dust which falls on plates and is consumed.
The university academics made the discovery after putting Petri dishes containing sticky dust traps on the table next to dinner plates in three homes at meal times.
Up to 14 pieces of plastic were found in the Petri dishes at the end of a 20-minute meal – the equivalent of 114 plastic fibres falling on the average dinner plate given their much larger size.
The scientists, from Heriot-Watt University concluded that the average person swallows up to 68,415 potentially dangerous plastic fibres a year simply through sitting down to eat.
People ingest anything from 13,731 to 68,415 fibres in a year during meals because of household dust.
Dr. Ted Henry, senior author of the study and professor of environmental toxicology at Heriot-Watt University, said: "These results may be surprising to some people who may expect the plastic fibres in seafood to be higher than those in household dust.
"We do not know where these fibres come from, but it is likely to be inside the home and the wider environment."
The plastic fibres found in the home-cooked meals did not come from the food or the cooking environment, but household dust, the authors believe.
Eating is the way in which humans can ingest this dust, as well as breathing it in from the air.
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