SkumaWater
You claim “This is especially the case for magnesium where drinking water contributes to 20-40% of your daily requirements (p.69 of previous source).”
That is a remarkable over-simplification of the source data, using data that deviates from the mean in the hope that it better supports your claim, and still you manage to come to the opposite conclusion from the source text. The actual text from the document you reference, reads -
“Although there appears to be a close association of magnesium and cardiovascular disease, it seems unlikely that this relationship can only be attributed to a deficiency of calcium and magnesium in drinking water, because only 10-20% of the total daily intake of calcium and magnesium is derived from drinking water, unless that marginal contribution were significant to deficient diets. In some geographical areas, the magnesium content of drinking water may provide 20-40% of a person’s daily requirement…”
and
“It is true that the contribution of magnesium in water to the total intake may be small, compared to the amount ingested in food.”
