Yeast sensitivity is caused by an overgrowth of yeast, primarily in the colon, which is the large intestine. Our body has normal autotocthonous, commensal bacteria which live within us in a symbiotic, friendly, relationship. These normal bacteria exist within the large intestine and within the oral pharynx. Additionally, in women, they are found in the vagina. These bacteria provide a barrier on the mucosal lining of these various tissues, preventing abnormal bacteria and yeast from entering the system.
Whenever an individual takes antibiotics, those antibiotics are meant to kill abnormal bacteria in whatever location the infection exists, whether the infection is sinusitis, pharyngitis, bronchitis or any other infection. Unfortunately, the antibiotics kill not only bad bacteria, but they also kill normal bacteria in other areas of the body. Women often will develop yeast vaginitis. Although yeast vaginitis may be treated, the primary reservoir for yeast is within the colon.
Yeast is in the same family as mold and fungus. Once yeast overgrows in the colon, it is like weeds in a garden. It cannot be eradicated unless it is killed. Yeast in the system causes two problems:
It produces toxins which depress the immune system and make it more reactive to allergy, which leads to more infections and more antibiotics, the killing of more good bacteria, and a further increase in yeast levels
An individual with increased levels of yeast in his system often becomes allergic to yeast, and therefore, allergic to food products which contain yeast, such as wine, beer, and breads.