People might be ingesting up to five grams of plastic a week, a study revealed on Wednesday. The study by Australia's University of Newcastle was commissioned by global conservation body WWF International.
The study said the largest source of plastic ingestion was drinking water, and the average person could be consuming 1,769 particles of plastic every week from water alone.
In the United States, for example, 94.4 per cent of tap water samples contained plastic fibres, with an average of 9.6 fibres per litre.
Companies are trying to become greener as consumers become increasingly aware of the impact of plastic, with millions of tonnes of food packaging and bottles ending up in landfills and oceans each year.
The world's biggest yogurt maker Danone and food packaging giant Tetra Pak are among companies leading a global scheme to reduce plastic waste as public concern rises over the environmental damage caused by rubbish.
The 3R Initiative aims to reduce, recover and recycle more plastic waste by helping companies measure and reach pollution-cutting goals.