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High levels of mercury in the blood, caused by eating lots of seafood, can cause male infertility. Researchers gave blood tests to 150 infertile couples who were having in-vitro fertilization and 26 fertile couples to find out how much mercury they had in their systems. They were also asked how much seafood they ate, as well as about other sources of mercury, such as fish oil supplements. They found that the infertile group had much higher blood mercury concentrations.
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