Many food allergies are the result of incomplete sterilization and conversion of the food we eat. Incomplete sterilization is caused by insufficiently strong hydrochloric acid in the stomach. This disorder is called Hypochlorhydria. It is common in people over the age of 50, but not limited to any age group. It a common occurrence in babies and toddlers, because their digestive system is not fully developed. Allergies can also be passed from the mother, if she has allergies, to the child. A good indicator of low stomach acid is a child that has serious yeast issues. Many older people develop food allergies that they never had at an earlier age. This is primarily due to the stomach cells that produce the hydrochloric acid starting to wane in their ability to produce strong enough acid. When food enters the stomach it is mixed with hydrochloric acid pepsin and a host of other enzymes. The peptic enzymes breakdown proteins into peptones, which are the building blocks for the amino acids, necessary to sustain life. The hydrochloric acid (HCL) turns the nutrients into a thick liquid mass called chyme. The peptic enzymes are most active in the conversion of proteins when the strength of the acid is at 1.0 to 1.2 pH. When the strength of the HCL diminishes, the peptic enzymes become less active in the conversion process. At 5.0 pH the peptic enzymes are not active at all in the conversion of proteins. At pH 4.5 to 5.0, average, the stomach contents are dumped into the small bowel. When raw unconverted proteins and other nutrient are into the small bowel the immune system is activated and causes an allergic reaction. Many proteins are allergens and will cause allergies if they are not destroyed by the conversion and sterilization process. Hypochlorhydria (low stomach acid) will allow bacteria, parasites and pathogens to flourish in the digestive tract. Anyone with food allergies should have a pH diagnostic test or gastrogram. There is a lot of good information on the net, search for pH capsule, gastrogram, or pH diagnostic test.