Doctor Brownstein, the leader of the Iodine Protocol says that a balanced pH is essential to his protocol:
"My experience has also shown that proper mineral support also aids Iodine supplementation. Testing for mineral deficiencies and correcting these deficiencies before instituting Iodine supplementation leads to the best results. I frequently have my patients measure their pH levels. If an acidic condition is present, correcting the pH imbalance before beginning iodine therapy is the correct way to go. How do you correct a pH imbalance? Eating whole foods, eliminating refined foods, beginning mineral supplementation including magnesium can all help the situation. Iodine itself is also an alkalinizing agent for the body. http://logosnutritionals.com/articles/naturalhealthgener/iodinetherestofthe/
Also see this confirming article for why it is important to him http://www.gallbladdercomplete.com/the-ph-balance/
It is easy to adjust pH by simple diet changes http://www.iconperformanceonline.com/?p=3678