I know a lot of you who post have horrific cases that can't seem to improve so I am posting a quote by Andy Cutler (the mercury chelation chemist):
"Yeast is actually a brain related problem (it is controlled by inadequate hormone levels, especially hydrocortisone) and while it improves with body detox, it doesn't go away until the brain is cleared if it is a real bad case."
I easily had a raging case of candida for 20 years because of mercury fillings and THANKFULLY because I got them out and chelated my tail feathers off...it has seriously eased (major puffiness/weight loss and rare Sugar cravings).
If you do not have mercury in your body and are eating Sugar free and all of the other "candida diet" requirements...you might want to look at your hormone levels to see if balancing those will give your body the ability to balance the yeast.