If women want to clean up their diets before conception, how long does it take for these pollutants to leave their systems? To find out, researchers asked people to eat one large serving a week of tuna or other high-mercury fish for fourteen weeks to boost their levels of the heavy metal and then stop. By measuring how fast the subjects’ mercury levels dropped, the scientists were able to calculate the half-life of mercury in the body.25 The subjects appeared to be able to clear about half the mercury from their bodies within two months. This result suggests that within a year of stopping fish
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