Yeast intolerance is a common cause of IgG food intolerances, and it is important to differentiate between bakers and brewers yeasts, which are found in different foods and drinks.
Manifesting as bloating, Irritable Bowel Syndrome (IBS), weight gain, fatigue, skin problems, migraines or joint pain, even a mild food intolerance to yeasts, or other foods, may have a major impact upon a person’s day to day activities, and the inclusion of yeast in a western diet is so common that the actual intolerances can be difficult to find, and also to avoid successfully.
Smartblood Story - Kathryn's Yeast Intolerance