There is no reliable scientific method that consistently measures how much plastic people consume each week, so the claim that it equals a credit card's weight is not proven.
Mechanism
Synthesis from 2 studies
When people eat fish or shellfish, tiny plastic bits inside the animals get swallowed and pass through the gut without being absorbed, then come out in poop. But scientists haven't agreed on how to count these bits accurately across all foods, so we can't say for sure if people really swallow a...
Most probable mechanism
When people eat seafood like shellfish or small fish, tiny plastic particles in the animals' bodies get swallowed and pass through the digestive tract without being broken down or absorbed.
Microplastic particles present in the tissues of marine organisms are consumed by humans during ingestion of seafood.
These particles remain intact as they travel through the gastrointestinal tract due to their resistance to enzymatic degradation.
The particles are excreted in feces without entering systemic circulation in measurable quantities.
Evidence from Studies
Supporting (2)
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Contradicting (0)
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Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.