Yeast is a very common fungi present in the most of the food items and many people show intolerance towards it, which means their body is incapable of digestion lactose, which is the main and basic compound of yeast. Yeast intolerance means that their body’s over produce Candida. Candida is a group of yeast-like fungi that lives in moist areas of the body, including the mouth, intestines and vagina. Helpful bacteria within the body can also be killed off by antibiotics causing the fungus grows rapidly as well.