Candida albicans is a fungus that is occasionally present in the mouth and can overgrow (e.g., thrush) when a person’s immune system is weakened. The most important aspects of prevention program are avoidance of sugar, alcohol, and dairy products. All three provide simple sugars for the fungus to feed upon. (Kaiser, Jon D., MD. Immune Power. p 28, 168-169. NY: St. Martin’s Press, 1993.)