Well... your
body is designed to be alkaline. Your fluids (70% of your
body) are alkaline... including your blood, intracellular and extracellular fluids. But...
Your
body is acidic by function. The basic process of metabolism creates acids. When you can't buffer the acids that are created, then they can build up and lead to problems.
Having said that, you can indeed alter the pH environment in your
body. pH is not only regulated by respiration it is also regulated by your buffering systems (minerals, etc.)
D