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A recent landmark article has cited a connection between non-insulin dependent diabetes and low-level arsenic in our drinking water.
- Approximately 13 million in the USA are drinking water that contains Arsenic levels higher than EPA allowable standards
- This study controlled for organic arsenic (found in seafood) and was looking for the effect of inorganic arsenic which is the more toxic compound - don't have to stop eating sushi
- This study essentially found a dose response curve with people with lower arsenic levels having lower incidence of non-insulin dependent diabetes, those with higher levels, higher risk.
References
Navas-Acien A, Silbergeld EK, Pastor-Barriuso R, Guallar E. 
Arsenic exposure and prevalence of type 2 diabetes in US adults. JAMA. 2008 Aug 20;300(7):814-22.