If you think you can do the same with your blood pH, you are a complete idiot, just like the person whoever invented the idea of this "酸性体质" quackery.
blood pH - The normal pH of the body (blood) is 7.35 to 7.45. Exceptions -
if you just ran a marathon, the accumulation of large amount lactate may cause your body pH to go slightly acidic, but no worry, your body can regain the balance quickly assuming you are healthy;
if you have kidney failure or suffering from metabolic acidosis, you can go through dialysis to stay alive, or die.