from the article above:

"Our body pH is very important because pH controls the speed of our body's biochemical reactions. It does this by controlling the speed of enzyme activity as well as the speed that electricity moves through our body. "

Now, we can link halogen imbalance to body pH in many ways. First and possibly foremost for many involves the inhibitory effect that fluorides have on the body's enzymes. If the body's enzymes (catalysts) are poisoned (look up "catalyst poison" on goog) by fluoride (from chronic fluoride intake, regardless of source) so that the number of optimally-functioning enzymes in the body is substantially diminished, then the body's natural feedback mechanism for controlling enzyme activity by pH control will be less effective than it would be in the absence of the fluoride inhibition, and it will try its best to accommodate the lack of response of the body's enzymes by LOWERING the body's pH, so as to "speed things up". Notice the sections in the article in the link above that says that lowering the pH speeds things up.

The body goes more acidic, to compensate for decreased enzyme activity caused by chronic fluoride-induced enzyme inhibition.

Answer: minimize fluoride intake. if possible move those fluorides out by displacement.