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A Spoonful of Sugar: Human Exposure to Microplastics Through Consumption of Processed Sugarcane
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Researchers found tiny plastic particles (microplastics) in both white and brown sugar, likely coming from equipment used during processing rather than the plants themselves or packaging. Based on typical sugar consumption, people could be ingesting far more plastic from sugar than from salt or other foods previously studied, a reminder that everyday pantry staples may be a bigger source of plastic exposure than we realized, though more research is needed to understand what this means for our health.
With increasing evidence of ingestion and uptake of microplastics (MPs) and nanoplastics by humans, combined with potential toxicological impacts from exposure and accumulation, it is important to understand their primary exposure routes. The ingestion of MPs via consumption of MP-contaminated foodstuffs appears to be an important exposure route for humans. The current study investigated MP levels in commercially available processed white and brown sugars, attempted to identify the primary sources of MP contamination and estimated human exposure to MPs from sugar consumption. The abundance of MPs varied from 18 to 34 items/100 g (270 ± 82 items/kg) in white sugar and from 4 to 20 items/100 g (103 ± 85 items/kg) in brown sugar. The most common MP type was <1 mm in size, black in colour and fibre-like in morphology. The MPs were comprised of PP, PET, CP and PEU, with PP and PET being the most abundant polymers observed in both white and brown sugars. Physicochemical characterisation of the MPs found in the sugar samples suggests that processing steps, and not uptake from soil by sugarcane plants or contamination from plastic packaging, are the main source of MP contamination. Energy-dispersive X-ray spectroscopy (EDAX) revealed a range of elements present on the MP surfaces, some of which are known to be toxic. These might have been derived from metal-based plastic additives or adsorbed from the surrounding environment. Using the available sugar intake data, we estimated that the annual intake of MPs by an average person is approximately 11,262 items/kg-bw/year for white sugar and 10,204 items/kg-bw/year for brown sugar. These MP ingestion levels are at least an order of magnitude higher than for salt and other foodstuffs. The results of this study can serve as a useful basis for implementing mitigation actions to reduce MP contamination during refined sugar production.
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Human Exposure to Dietary Microplastics and Health Risk: A Comprehensive Review
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This comprehensive review examines human dietary exposure to microplastics through bottled water, seafood, packaged foods, and crops grown in plastic-mulched soils, cataloging toxicity mechanisms including immune disruption, gastrointestinal damage, and developmental cytotoxicity, with MPs shown to transfer via placenta and breast milk. The multi-pathway exposure evidence reviewed here highlights that microplastic ingestion is a universal human experience beginning before birth, with plausible health consequences that demand urgent investment in mechanistic in vivo research.
Microplastics in Human Food Items
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Researchers documented the widespread presence of microplastics across the human food supply — found in seafood, salt, honey, beer, and tap water — highlighting that virtually no food category is free from plastic contamination and that daily dietary exposure is unavoidable.
Microplastics in Human Health
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Researchers reviewed the detection of microplastics across freshwater, marine, and terrestrial environments and synthesized emerging evidence on their health effects in humans. The paper examines how particle characteristics — origin, shape, and polymer type — influence toxicological outcomes and bioavailability.
Microplastics in Food: Health Risks
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Researchers reviewed the emerging evidence of microplastic contamination across common food items — including seafood, table salt, and drinking water — and assessed the largely unknown implications for human health, highlighting the critical knowledge gap between confirmed dietary exposure and understanding of downstream biological effects.
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Researchers reviewed how microplastic fragments smaller than 5 mm form from degraded consumer products and enter the human body through inhalation, ingestion, and dermal contact. The paper summarizes known and suspected health impacts across organ systems and identifies key research gaps in understanding long-term human exposure.
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