There are many ways that a yeast problem can develop. In people who have celiac, the villi which produce the enzymes to break down the food are damaged. Yeast can use the undigested food as a food source. Yeast grows 200x more in the presence of sugar. So a diet that includes a lot of highly refined sugar and carbohydrates can also lead to a yeast overgrowth. Often, gluten free processed foods are loaded with sugar, which feeds the yeast. According to Dr. Teich, yeast doesn't grow in agave, so it is a better choice to use as a sweetener.
My son's yeast overgrowth presented as hyperactivity, unusual behavior, a rash on his face, and an itchy diaper rash. When I gave him Nystatin, prescribed by Dr. Teich, his crazy behavior and rash got better. But it was only when I really made a vigilant effort to remove every little bit of sugar from his diet, that he got better.
Several months ago, a dermatologist I consulted about the rash on his face said it was "eczema". The physician said they didn't know what caused eczema and for half of the people it went away and half of the people it was a lifelong problem. Then he took out his prescription pad and wrote a prescription for a steroid cream. I was pretty surprised that he didn't have a more specific name for the rash. Eczema seems so vague and too general to suggest any cause or cure. But I followed his advice just to see where it would lead me. The cream helped when I used it but as soon as I would stop the rash would return.
I started treating my son's yeast overgrowth when his calm personality disappeared and he became unusually mean and aggressive after eating a slice of yeasty gluten free sourdough bread. Several days later I gave him some Nystatin we had around from last summer and his aggression disappeared and he sat down and ate his breakfast. I saw his behavior go up and down over the months we treated him with medication that eradicates yeast. Once school ended and the parties were over, I got super serious and eliminated every bit of sugar from his diet and
continued with a small dosage of Nystatin. Magically, his rash disappeared and his behavior settled.
It's not science, but that is our gluten free families experience of treating yeast.
Here are some tips for eliminating yeast: 1)Eliminate sugar. 2) Use probiotics 3) Use enzymes to break down the food so it doesn't become food for the yeast 4) See a doctor who understands the chronic problems associated with yeast overgrowth.
Here are some good links to more information: