If you already have a yeast problem, avoiding fermented foods (such as aged cheese, vinegar, wine and beer) and fungus such as mushrooms for a while would be a good idea. The other thing that yeast absolutely loves is sugar. I never had a yeast infection in my life until my mid-30's when my blood sugars got out of control. Then I was having one a month on average.
I haven't had a yeast infection since I started low carb over 3 years ago.