Ocean

From fish to honey: nothing is safe from microplastics

A grey mullet is shown next to microplastic found in Hong Kong waters during a Greenpeace news conference in Hong Kong, China, April 23, 2018. REUTERS/Bobby Yip  TPX IMAGES OF THE DAY

Microplastics can now be found throughout the food chain both on land and in the oceans. Image: REUTERS/Bobby Yip

Christina Thiele
PhD Candidate, University of Southampton
Malcolm David Hudson
Associate Professor, University of Southampton
Share:
Our Impact
What's the World Economic Forum doing to accelerate action on Ocean?
The Big Picture
Explore and monitor how Ocean is affecting economies, industries and global issues
A hand holding a looking glass by a lake
Crowdsource Innovation
Get involved with our crowdsourced digital platform to deliver impact at scale
Stay up to date:

Ocean

We’re increasingly aware of how plastic is polluting our environment. Much recent attention has focused on how microplastics – tiny pieces ranging from 5 millimetres down to 100 nanometres in diameter – are filling the seas and working their way into the creatures that live in them. That means these ocean microplastics are entering the food chain and, ultimately, our bodies.

Image: Futurity

But fish and shellfish aren’t our only food sources that can contain microplastics. And, in fact, other sources that don’t come from the sea might be much more worrying.

A portion of consumer-grade mussels in Europe could contain about 90 microplastics. Consumption is likely to vary greatly between nations and generations, but avid mussel eaters might eat up to 11,000 microplastics a year.

It’s harder to know how many microplastics we might be consuming from fish. Most studies to date have only analysed the stomach and gut content of these organisms, which are usually removed prior to consumption. But one study has found microplastics in fish liver, suggesting particles can get from digestive tissues to other body parts.

Microplastics have also been found in canned fish. Numbers identified were low, so the average consumer might only eat up to five microplastics from a portion of fish this way. The particles found might also come from the canning process or from the air.

Another marine food source of microplastics is sea salt. One kilogram can contain over 600 microplastics. If you eat the maximum daily intake of 5 grams of salt, this would mean you would typically consume three microplastics a day (although many people eat much more than the recommended amount).

However, other studies have found varying amounts of microplastics in sea salt, possibly because of different extraction methods used. This is a widespread problem in microplastics research that makes it hard or impossible to compare studies. For example, one study seems to only have looked for microfibres (tiny strands of artificial materials such as polyester) while a further study only looked for microplastics larger than 200 micrometres.

The sea salt study mentioned above didn’t attempt to remove and count all the microplastics from its salt samples and instead gave an estimate based on the proportion of particles that were recovered. This means it showed 1 kilogram of salt contained at least 600 microplastics – but the actual figure could be a lot higher.

Non-marine sources

Despite these findings, other research demonstrates that far more microplastics in our food are likely to come from other sources than the sea. Land animals also eat microplastics although – as with fish – we tend not to eat their digestive systems. There’s limited data about this part of the food industry, but a study of chickens raised in gardens in Mexico found an average of 10 microplastics per chicken gizzard – a delicacy in some parts of the world.

Scientist have also found microplastics in honey and beer. We might be swallowing tens of microplastics with each bottle of the latter.

Have you read?

Perhaps the biggest known source of microplastics that we consume is bottled water. When researchers examined a variety of types of glass and plastic water bottles, they found microplastics in most of them. Single-use water bottles contained between two and 44 microplastics per litre, while returnable bottles (designed for collection under a deposit scheme) contained between 28 and 241 microplastics per litre. The microplastics came from the packaging, which means we could be exposing ourselves to more of them every time we fill up a plastic bottle in order to reduce waste.

There is also evidence that microplastics in food come from indoor dust. A recent study estimated that we could get an annual dose of almost 70,000 microplastics from the dust that settles on to our dinner – and that is only one of our daily meals.

So, yes, we are eating small numbers of microplastics from marine products. But it may only take drinking a litre of bottled water a day to consume more microplastics than you would from being an avid shellfish eater. And the other question scientists have yet to answer when it comes to microplastics in our food is how much harm they actually do

Loading...
Don't miss any update on this topic

Create a free account and access your personalized content collection with our latest publications and analyses.

Sign up for free

License and Republishing

World Economic Forum articles may be republished in accordance with the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License, and in accordance with our Terms of Use.

The views expressed in this article are those of the author alone and not the World Economic Forum.

Related topics:
OceanFuture of the Environment
Share:
World Economic Forum logo
Global Agenda

The Agenda Weekly

A weekly update of the most important issues driving the global agenda

Subscribe today

You can unsubscribe at any time using the link in our emails. For more details, review our privacy policy.

From reserves to revenue: How marine protected areas can drive economic growth

Mark John Costello

April 8, 2024

2:00

About Us

Events

Media

Partners & Members

  • Join Us

Language Editions

Privacy Policy & Terms of Service

© 2024 World Economic Forum