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June 1, 2005

Magnesium Intake, Drinking Water, and Risk of Colorectal Cancer

Author Affiliations

Letters Section Editor: Robert M. Golub, MD, Senior Editor.

JAMA. 2005;293(21):2599. doi:10.1001/jama.293.21.2599-a

To the Editor: The Brief Report by Dr Larsson and colleagues1 concluded that magnesium intake was inversely associated with the risk of developing colorectal cancer in women. In estimating the magnesium intake, food content of this metal ion appears to have been appropriately measured. However, the content of magnesium in local drinking water was not assessed. Variations of the magnesium content of water in the geographical area that was investigated are considerable.2

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