Q: Will pure BEV water leach minerals from my body?
A: This question reflects one of the common myths that are found in the water industry. It has no basis in fact or physiologic science. Pure water does perform a valuable function by helping the body eliminate wastes and unused minerals that have been excreted from cellular tissues, but it does not "leach" minerals out of the cells. This false claim was probably first made by companies wanting to boost sales of filters incapable of removing dissolved minerals.
One role of the kidneys is to maintain the balance of electrolytes in the blood. If the levels of calcium, magnesium, or potassium, for example, are dropping, the kidneys will reabsorb these from urine, not allowing them to be excreted. If someone were to be difficient in these minerals, a medical expert will look to diet, enzymatic activity, or kidney function.
Comment from the president & founder of Pure Water Systems...
One can find a number in interesting articles on the internet stating consumption of mineral free water (e.g. distilled water, de-ionized water) leads to mineral deficiencies, with one article going on to state “Early Death Comes from Drinking Distilled Water” (Zoltan P. Rona, MD).
This article is found on the web site of Dr. Joseph Mercola. Dr. Mercola's site offers a lot of valuable information, but also contains a great many inaccuracies and sensational comments. (Tufts University reviewed Dr. Mercola's site with respect to his newsletter, and scored it with a 15 out of 25 possible points. This amounts to a “Not Recommended” overall rating due to “Unacceptable Accuracy.”
There are a number of other web sites that have re-published Dr. Rona's article, and the great majority use this article to promote their own products, usually alkaline water machines.
While I respect the education required to obtain a medical doctorate, Dr. Rona's article lacks any scientific credibility. One of the most important questions any scientist ever asks is “What else can explain that?” Applying even the smallest amount of scientific method when looking at Dr. Rona's conclusions begs us to look for further evidence, evidence that will either support or conflict with the findings.
If we assume Dr. Rona is correct, then we could simply look for any instances of large populations that drink mineral free water. One such community comes to mind: Vancouver, Canada—a city with well over a 2 million inhabitants, and a water supply containing the least amount of naturally occurring minerals I have ever measured. In fact, the amount of calcium and magnesium naturally occurring is less than 2 ppm. (This is lower mineral content than most typical reverse osmosis systems are capable of producing.)
If Dr. Rona is correct, we should expect to see the entire population of Vancouver suffering from mineral deficiencies and having a mortality rate significantly different from areas with very hard water (see the reference to Lubbock, TX in the previous answer). Unfortunately for Dr. Rona's assumptions, the population of Vancouver does not suffer, as a whole, from any increased mineral deficiency, associated conditions, or lowered mortality.
Dr. Rona goes on to state water passed through a solid charcoal filter is slightly alkaline, but this depends totally on the pH of the water entering the filter and the type of carbon used. He also states reverse osmosis water tends to be neutral, but RO water is usually slightly acidic since RO does not remove carbon dioxide, and even the smallest amount (4 ppm) of CO2 in extremely pure water can move the pH as low as 4.5. (In high purity water, this would be considered an extremely weak acid.)
Further, if hard, alkaline water is indeed superior to other waters, we should see increased longevity and improved overall health scores for any population that consumes this water. In fact, one would expect to find measurable differences in disease tendencies between the residents of Vancouver and any city with hard, alkaline drinking water, given the huge differences in mineral content. There is no evidence supporting such a correlation. (Keep in mind that Prof. Vincent's original research did find statistical evidence—but the evidence contradicts Dr. Rona's assumptions. Prof. Vincent's research suggested the populations with water supplies that were alkaline and oxidized had greater incidence of cancer, thrombosis, coronary heart disease, and viral infections.)
Dr. Rona is wrong to suggest drinking mineral free water is detrimental to your health.
— Robert M. Vineyard, President