Pelo menos são-o nos ratos. É sobre o efeito toxicológico não linear (uma pequena quantidade pode fazer pior do que uma quantidade maior da substância tóxica):
https://gizmodo.com/study-suggests-bpa-free-plastics-are-just-as-harmful-to-1829033127
Citando:
"Regulatory agencies such as the Food and Drug Administration still maintain that current levels of BPA exposure in food are not a concern to human health, pointing to research showing that people metabolize BPA faster than mice, dulling any possible toxic effects. But Hunt says this assumption has relied on traditional methods of toxicology, which might miss the subtler effects caused by low doses of BPA and similar chemicals.
“You might expect a linear response—the more you give, the worse it is. But these types of chemicals don’t behave that way; they behave like hormones or some drugs we take, where a tiny bit can exert a powerful effect, but bumping the dose up might abolish that effect or induce a new one,” said Hunt. “And yet the FDA doesn’t want to believe there’s a low-dose effect, even though there’s some evidence of that in their data.”"
