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June 1, 2005

Magnesium Intake, Drinking Water, and Risk of Colorectal Cancer—Reply

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

In Reply: We agree with Dr Wiklund and colleagues that it would be ideal to take into account local variations of magnesium concentration in drinking water in the calculation of magnesium intake. Unfortunately, in the Swedish Mammography Cohort we did not have information collected on water consumption. To accurately calculate magnesium intake from drinking water, we would also need to know not only area of residence of the participants but also how much water is consumed away from home and from other sources.