There are no established health effects of microplastics.
It'd be more true to say, "There are no established significant health effects of microplastics on humans." FWIW, the article you linked to doesn't say "no effects", but "limited evidence for significant adverse health impacts".
When reading research papers, ‘significant’ is usually meant to mean ‘statistically correlated’ which varies from our typical lay definition of ‘very impactful’, which would be described using the term ‘effect size’
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It'd be more true to say, "There are no established significant health effects of microplastics on humans." FWIW, the article you linked to doesn't say "no effects", but "limited evidence for significant adverse health impacts".
This seems concerning: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9885170/
When reading research papers, ‘significant’ is usually meant to mean ‘statistically correlated’ which varies from our typical lay definition of ‘very impactful’, which would be described using the term ‘effect size’