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In her book Digestive Wellness, Elizabeth Lipski, PhD,CCN explains how consuming even one can of soda can drastically affect pH:
One can of cola contains enough phosphoric acid to significantly change our pH. The kidneys cannot excrete urine that is more acidic than about 5.0 without damaging them or the bladder. The pH of cola is between 2.8 and 3.2, about a hundred times more acidic than a pH of 5.0. To dilute this to an appropriate level, you'd need thirty-three liters of urine. So, the body has another mechanism—using buffering minerals from elsewhere in the body. If there are enough reserves, the body will pull sodium and potassium to do this. If not, it will pull calcium, magnesium and other minerals from the bones. The amount of minerals necessary would be the buffering capability of four TUMS. One can imagine the effects of drinking several cans of cola or one Big-Gulp daily.
Consider a typical fast food meal, with a large soda, fries and cheeseburger, combined with the often high levels of stress experienced on a daily basis, and it's easy to see how quickly acid levels can rise.