Oats feeds candida because it contains gluten, starch, and natural sugars. “Bran is the hard outer layer of grain and consists of combined aleurone and pericarp. Along with germ, it is an integral part of whole grains, and is often produced as a by-product of milling in the production of refined grains. When bran is removed from grains, the grains lose a portion of their nutritional value. Bran is present in and may be milled from any cereal grain, including rice, corn (maize), wheat, oats, barley and millet. Bran should not be confused with chaff, which is coarser scaly material surrounding the grain, but not forming part of the grain itself.
Bran is particularly rich in dietary fiber and essential fatty acids and contains significant quantities of starch, protein, vitamins and dietary minerals.”
Oat bran is allowed on the diet and not oatmeal. Bananas are not allowed on the diet because they contain about 25g+ of sugar per serving. If you want a good reason why you have oral thrush, I would look no further than the bananas you are feeding to the candida.