The most important thing to cut out is sugar . This includes all cookies, candies and anything else of that nature. Yeast feeds off sugar and the only way to keep it at bay is to starve it. This might be hard, considering that your body has been feeding off of it for so long, but it's the only way. If you cheat and have a candy bar, don't expect to feel alright ten minutes later.
Caffeinated items are also very strenuous on the bladder, the stomach and the prostate.
All refined white flours and grains should be removed from the diet, too. The only way to tell is to do a taste test. By eating one thing at a time, you'll have a much easier time figuring out what negatively effects you and what is ok. Vinegar must also be avoided as it is depletes the stomach of acids and can cause inflammation. The only vinegar that has been known to successfully combat yeast is apple cider vinegar and it can be used as a food or as a wash.