A new study has found that the global average of microplastic ingestion could be as high as five grams a week per person, which is the equivalent of eating a teaspoon of plastic - or a credit card - every week.
Shellfish was another big source.
Microplastics - plastic particles that do not exceed five millimetres in size - can potentially pose a direct or indirect threat to humans via ingestion or by acting as "stressors" or carriers of contaminants, the university said.
They looked at the presence of microplastics in a number of food and drinks, such as water, beer, fish, salt and honey.
"Developing a method for transforming counts of microplastic particles into masses will help determine the potential toxicological risks for humans moving forward", comments Dr Thava Palanisami, project co-lead and microplastics researcher at the University of Newcastle. The research also found that the largest source of ingesting microplastics was via drinking water.
It added that mismanagement of microplastics may cause the material to accumulate and/or be transferred through the food chain, ending up in our digestive system and bloodstream.
Shellfish is the second biggest source of plastic ingestion, with the average person consuming as many as 182 microparticles - 0.5 grams - from this per week.
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'Not only are plastics polluting our oceans and waterways and killing marine life - it's in all of us and we can't escape consuming plastics, ' he said in a statement.
Professor Richard Lampitt, of the UK's National Oceanography Centre, who was not involved in the research, told CNN that it was hard to assess the significance of ingestion rates without understanding the associated health risks.
But that doesn't mean plastics isn't a major problem, he added.
While the amount of plastic pollution varies by location, nowhere is untouched, and the U.S. reported the highest levels with 94.4% of tap water samples containing plastic fibres and an average of 9.6 fibres per litre.
But if microplastics are shown to damage human health, it will be very hard to remove them from the environment.
The World Wide Fund for Nature says since 2000 the world has produced as much plastic as all the preceding years combined.
The organisation is urging people to join the 665,000 people who have signed its global petition calling for global legally-binding treaty to tackle plastic pollution.