i think a white coated tongue is a sign of stagnant energy. fungus can grow where there is stagnation and darkness---like a pond of stagnant water sometimes has a coat of fungus on top.
i think we candida sufferers need to get our energy circulating more clearly. that is why we need colonics & enzymes to move stuff for us - we have blocked energy. worry and micro-analyzing food intake and thinking about germs can help to further block an already disrupted flow of healthy energy.