the Mail online | Mail - news, sport, showbiz, health and more | Regular showers may be health risk: "Taking regular showers could pose a health risk and even result in permanent brain damage, it has been claimed.
Scientists believe that breathing in small amounts of manganese dissolved in the water may harm the nervous system.
The damage may occur even at levels of the naturally occurring metal normally considered safe, say the US researchers."
Although manganese levels in public water supplies are monitored, regulators have not considered the long-term effects of inhaling vaporised manganese while showering, they claim.
Dr John Spangler, from Wake Forest University School of Medicine in Winston-Salem, New Carolina, who led the study, said: "If our results are confirmed, they could have profound implications for the nation and the world.
"Nearly nine million people in the United States are exposed to manganese levels that our study shows may cause toxic effects.
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