Baker's and Brewer's yeast are common & frequent food sensitivities that are very difficult to remove from our diets due to their pervasiveness. My suggestion is that if you are prone to yeast infections or feel that due to antibiotic use in the past you might have yeast overgrowth, then sensitivity to yeast in your diet is very possible. Here is a basic list of foods that contain yeast. Try to remove these foods and you will find that your energy will improve, your mind will be more clear and headaches will reduce significantly (just to name a few benefits for those who are sensitive).
Baker's Yeast (Hard to eliminate)
- Breads (except for authentic sourdough bread)
- Anything "risen" by yeast
Brewer's Yeast (Harder to eliminate)
- Alcohols including wine and beer (highest in yeast content), distilled alcohols (brandy, gin, vodka etc.). The exception to this are triple distilled vodkas and gins.
- Vinegars (red wine, balsamic, rice wine, some apple cider vinegars)
- Most condiments (ketchup, mustard, pickles, olives, relish, Worcestershire sauce, BarBQue sauces, MSG)
- Canned soups
Read labels and if vinegar is in the ingredient, then yeast is as well. Yeast is one of the few hidden foods that will not be listed on the label because yeast makes many of the ingredients on the list (like alcohol and vinegars, ketchup etc). So don't be fooled by labels.
If you feel you may be sensitive to a number of foods I recommend a IgG food sensitivity test to get the specific diet for your individual needs. Not all IgG food sensitivity test are created equal. The only lab our office uses is ImmunoLabs in Florida. Your doctor may be willing to order a test for you from them. Many labs offer the same sort of testing but due to lack of control and reproducibility there is a lot of false negatives and false positives.
Food allergies and Food sensitivities are not the same. Allergies are immediate hypersensitivity reactions and have immediate symptoms like itchy eyes, runny nose, sneezing, swelling of the throat. Food sensitivites are more subtle because it is a delayed hypersensitivity reaction that can take up to 72 hours to manifest. Long after you may have eaten the offending food and forgotten about the action altogether. Regarding fatigue and yeast, usually it is a sensitivity rather than a direct allergy to the yeast. By the way, allergies are IgE immune reactions and sensitivities are IgG immune reactions. These tests differ because they are measuring different parts of your immune system.