Here is another response I posted on the Candida board in regards to the myth of the body becoming acidic:
The body RARELY ever goes acidic. The acidity causing disease claims is really a myth. The body cannot survive if it becomes too acidic, or too alkaline. In fact a pH higher than 7.8 or lower than 6.8 will kill a person. This is why the body has so many redundant systems to maintain its narrow pH it can survive in. For example, breathing adjusts pH. If the body starts to get acidic our respiration increases to blow off CO2, which reduces carbonic acid, and the oxygen reduces acidic lactate. If the body starts to become too alkaline the respiration slows down to retain CO2, increasing carbonic acid. The body also generates bicarbonate to deal with acidity, can excrete hydrogen ions, carbonic acid or bicarbonate out through the urine or retain them to adjust pH. The body also uses phosphates and hemoglobin as buffers, and in severe cases can pull minerals from the bones as a buffer against acidity. Our pH is also regulated by proteins that can either bond or release hydrogen ions in response to pH imbalances. Here are some references for you:
This is why we rarely see acidosis (overly acidic blood) or alkalosis (overly alkaline blood). Acute acidosis can occur with severe vomiting and diarrhea, ketoacidosis, inadequate oxygen intake or utilization (respiratory acidosis), rhabdomyolosis, kidney failure and by poisoning with certain chemicals. Acute alkalosis can occur with over consumption of hydroxides including alkaline waters, consumption of milk with hydroxides, overuse of carbonates such as antacids or baking soda, prolonged vomiting, excessive aldosterone secretion, diuretic use and hyperventilation.
The pH of the lymphatic system is kept slightly more alkaline than the blood, so lymphatic acidosis does not occur.
Because chronic acidosis is so rare and diseases are so common even common sense should tell us that acidosis is not a cause of most diseases. Most often it is a byproduct of a disease, not a cause. So anyone who is going to claim that acidity is the cause of most or all diseases does not have a clue what they are talking about.
In fact we need a large number of acids to survive and thrive. These include hydrochloric acid, pyruvic acid, acetic acid, carbonic acid, hyaluronic acid, glucuronic acid, malic acid, lactic acid, citric acid, uric acid, fatty acids, amino acids, ascorbic acid, pantothenic acid, folic acid, etc.
And most pathogens are killed by acids and thrive in an alkaline environment. This is why the parts of the body that help protect us from pathogens are normally acidic. These include the skin, stomach, intestines and sinuses.