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.
Larsson SC, Wolk A. Magnesium Intake, Drinking Water, and Risk of Colorectal Cancer—Reply. JAMA. 2005;293(21):2599. doi:10.1001/jama.293.21.2599-b
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