"Low HCl production is associated with many problems. Iron deficiency anemia, owing to poor iron absorption, and osteoporosis, resulting in part from decreased calcium absorption, are two important problems. General allergies and, specifically, food allergies are correlated with low HCl. Poor food breakdown and the "leaky gut" syndrome are associated with food allergies (see Allergy program in Chapter 17). More than half the people with Gallstones show decreased HCl secretion compared with gallstone-free patients. Diabetics have lower secretion, as do people with eczema, psoriasis, Seborrheic Dermatitis , vitiligo, and tooth and periodontal disease. With low stomach acid levels, there can be an increase in bacteria, yeasts, and parasites growing in the intestines."