There is a widespread notion that consuming yeast, mushrooms, etc. exacerbates (makes worse), creates and contributes to yeast infections or candida. Further, much has been written on how much of the population is running around with systemic (spread throughout the body) yeast, causing everything from yeast infections in women to chronic fatigue. The bottom line is that people now are afraid to eat yeast, and blame health problems on yeast in the same way that modern medicine likes to blame almost all disease on bacteria.

Yeast “infections” in women are common, but they are not from eating yeast or mushrooms. Instead, they are the result of other factors (listed below).
Adjunctive Nutritional Schedule:
* Digestive Enzymes: 1 per meal
* Super Green Food: 1 tsp per day
* Immune System Food: 6 per day
* Probiotics (acidophilus, etc.) from your health food store
Avoid all sugar (from honey to syrup to table sugar: read all food and condiment ingredients carefully), avoid all alcohol, avoid antibiotics (talk to your doctor about this first), wear cotton underwear, not nylon), eat raw yogurt (read labels and avoid all the products with sugar), avoid caffeine, go on an Alkaline Diet.
Possible contributors to yeast problems include antibiotics, certain spermicides, birth control pills, excessive alcohol consumption, steroid use and even direct exposure of yeast to the vagina (eg. not washing hands after handling yeast for baking projects). The spermicide used to lubricate some brands of condoms can also kill protective flora found in the vagina, making it easier for troublemaking yeasts to thrive.
Robert Thiel, PhD, NMD, California researcher, "Systemic Mycoses: An Overview for Natural Health Professionals," The Original Internist, Dec. 2002, writes: "There is a misconception that people with mycotic [fungal] infections must always avoid yeast-containing foods. While this may be true in some cases, it is most often white flour, not the fact that bread has been leavened with yeast, that is the problem. Saccharomyces cerevisiae (the primary yeast used in baking and brewing) is beneficial to humans and can help combat various infections, including candida albicans, according to the German Commission E monograph. In the text Medical Mycology, John Rippon, PhD, wrote, 'There are over 500 known species of yeast, all distinctly different. And although the so-called "bad yeasts" do exist, the controversy in the natural foods industry regarding yeast related to health problems which is causing many health conscious people to eliminate all yeast products from their diet is ridiculous.' It should be noted that W. Crook, MD, perhaps the nation's best known expert on Candida albicans, wrote, "Yeasty foods don't encourage candida growth...Eating a yeast-containing food does not make candida organisms multiply.'" [Crook, W. The Yeast Connection: A Medical Breakthrough, 1986]
Mary Enig, PhD, Weston Price Foundation, writes, "Dried nutritional yeast is an excellent natural source of B complex vitamins (except for B12) plus a variety of minerals. .. Yeast does not contribute to candida as has been claimed—candida feeds on refined carbohydrates, not yeast. The late eminent physician Dr. Henry Bieler treated many cases of chronic fatigue with yeast supplements." (Nourishing Traditions: The Cookbook that Challenges Politically Correct Nutrition and the Diet Dictocrats, Sally Fallon with Mary G. Enig, PhD. , 1999)
Medical advisor Dr. Andrew Saul, author, Paperback Clinic, A Simplified Guide to Natural Therapeutics, writes, "Some people think that to avoid yeast infections, you should avoid yeast. This sounds almost plausible until you think about it. As with sharks, spiders, and snakes, there are all kinds of yeasts, but only a few of them are troublemakers. Most yeast infections are caused by one particular species, Candida albicans. These fungal critters, which are found in any healthy body, are normally kept in balance by your other resident flora of "good" bacteria and other microorganisms. But a low immune system, stress, poor nutrition, and especially antibiotic use, can bring on a Candida overgrowth...You do not cook with Candida when you bake bread. You do not eat Candida when you eat cheese. And even if you did, I doubt if Candida could survive the trip through your highly-acid stomach. And your body is quite happy digesting brewers' and nutritional yeasts, which are very nutritious, and loaded with B-vitamins, trace minerals, and the Glucose Tolerance Factor (GTF). I think categorically eliminating yeast from the diet is barking up the wrong microbial tree." ("DOCTOR YOURSELF," Dr. Andrew W. Saul, doctoryourself.com)
Stanley Gershoff, PhD, Dean Emeritus, Tufts University School of Nutrition, writes, "It is unreasonable to assume that Candida could cause the wide array of symptoms attributed to them, because they are ubiquitous organisms that inhabit the mouth, skin and intestines of most healthy people without creating any problems. It is true that for a few people, Candida cause fungal infections on such areas as the skin and nails, but in no way do these individuals manifest the host of problems ascribed to 'yeast sensitivity.' Further, there is no evidence that the foods to be avoided stimulate yeast growth or weaken the immune system, as proponents of this theory claim." (Gershoff, PhD, Stanley, The Tufts University Guide to Total Nutrition, p. 281)
Recommended reading: Robert Thiel, PhD, NMD, "Systemic Mycoses: An Overview for Natural Health Professionals," The Original Internist, Dec. 2002, Clint Publications.
Disclaimer
Always coordinate your health program with a qualified health care practitioner. The nutrients in each Adjunctive Nutritional Schedule are not meant to treat or cure disease or yeast infections, but rather to support health. The FDA has not evaluated any statements made herein. All products have been formulated based on sound scientific and medical research. No artificial ingredients are used.