According to health and longevity enthusiasts like MIT's Ray Kurzweil and Dr. Terry Grossman (whose incredibly informative book Fantastic Voyage I am reading now), the blood's pH level is very tightly controlled to fall somewhere between 7.35 to 7.45. To maintain this pH level, the body neutralizes acidic drinks like softdrinks with alkaline blood buffers.
The problem is that when we keep on ingesting acidic foods and drinks, we use up our body's limited supply of alkaline buffers and thus they become unavailable to neutralize the other acidic waste products continually produced by our bodies, including organic byproducts of digestion such as acetic acid, lactic acid, carbonic acid, and uric acid. When we don't have enough alkaline buffers to neutralize these acidic waste products, our bodies sustain health damage and become ideal for the development of cancer cells.
Because of this need to preserve the alkalinity in the blood, Kurzweil and Grossman specifically recommend to drink only alkaline water (of pH up to 9.5 and 10).
The above recommendation by Kurzweil and Grossman is the most controversial. Some say that this quack science is one proof that even a most brilliant scientist like Kurzweil could be so thoroughly misled. Water, these critics say, is basically electrically neutral.
Kurzweil and Grossman insist that that while water is indeed neutral, the location of the electrons make a huge difference. The side of the molecule with the hydrogen atoms is slightly positive in electrical charge, whereas the oxygen side is slightly negative. Because of these slight charges, water molecules combine to assume hexagonal or pentagonal shapes and these three-dimensional electrical properties of water are quite powerful in breaking apart strong chemical bonds of other compounds.
So should we all begin drinking alkaline water? Well, I don't know enough chemistry to independently evaluate both sides of the debate. However, when I telephoned one water supplier (Aqua Health) I learned that five gallons of alkaline water (pH 7.5) cost just about the same as the regular distilled water we were regularly ordering(Pesos 40-50).
Kurzweil and Grossman may be grossly wrong, but what if they're right? Therefore, for the same price as our old water supply, I began ordering alkaline water. I figured out I got nothing to lose, and a whole long life to gain.