I thought the whole point in focusing on resistant starches and foods such as cooked-and-cooled potatoes and rice was that they provided a good substrate to feed bacteria. If this is the case, why would they be unavailable for candida but available for beneficial bacteria? I've read, on numerous message forums, people claiming that RS doesn't feed candida but I have yet to see anything that I would constitute as solid evidence explaining the mechanism for this. Have you been able to find any research into this belief, beyond the anecdotal evidence that's out there?
I think people fall into a trap thinking that candida or yeasts will always behave the same way. There is still so much to be known about environments, commensals, metabolites, etc. Some eukaryotes (perhaps shortsightedly we all tend to just call it all "candida" as if there was only one invasive species of yeast on the planet) can adapt to ketones to fuel. Many seem to prefer fructose or refined sugars. Some will adapt and change their fuel source over time, etc. etc. These variances probably explain why some people do really well fighting candida with RS while a few others fail.
The research overwhelmingly suggests that normalizing GIT pH to slightly acidic seems to switch off the candida growth gene and render it benign. My favorite link, chockfull of research on how the pH of your GIT controls candida like a light switch:
Alkalinity promotes Candida overgrowth
The more soluble fibers (prebiotics) you eat, the more SCFAs are produced and the "acids" from those SCF
As will
lower the pH in the GIT. It's not a coincidence that virtually all "acids" will inactivate candida.
So... eating RS (or whatever fiber you prefer) may or may not feed candida, but for many people it's fairly moot if they have the right balance of bacteria in place to produce SCFAs that will normalize your GIT pH and inactivate candida. RS just happens to be very good (and cheap) at helping to produce the SCFAs and other metabolites that normalize pH and inactivate candida. But, you should be able to come to a similar result by consuming large enough quantities of other fibers. There are many fibers to choose from. RS is just cheap and easy and complex carbs from starches also tend to help support the immune system by providing the sugary building blocks for glycans responsible for supporting the immune system, such as Mucin-2 (which is 80% sugar by weight).
The point here is that RS is not absolutely required when fighting a candida infection, so long as you consume enough other fibers to normalize GIT pH. But, I would expect a moderate intake of complex starchy carbs to be beneficial in maintaining a healthy gut barrier and immune system.