This section of the book is from the "How and When to Be Your Own Doctor" book, by Dr. Isabelle A. Moser with Steve Solomon, published in 1997.
There are three ways a body can become allergic. (1) It can have a genetic predisposition for a specific allergy to start with. (2) It can be repeatedly exposed to an irritating substance such as pollen when, at the same time, the body's mechanism for dealing with irritations is weakened. Generally weak adrenals causes this because the adrenal's job is to produce hormones that reduce inflammation. Once the irritating substance succeeds at producing a significant inflammation, a secondary reaction may be set up, called an allergy. Once established, an allergy is very hard to get rid of.
(3) in a way very similar to the second, but instead of being irritated by an external substance, it is irritated by repeatedly failing to properly, fully digest something. Pasteurized milk for example, basically impossible to completely digest even in its low-fat form, often sets up an allergy that applies to other forms of cows milk, even raw, unpasteurized cows milk or yogurt. Eating too much white flour can eventually set off a wheat allergy. My husband developed a severe allergy to barley after drinking too much home-brewed beer; he also became highly intolerant to alcohol. Now he has allergic reactions to both alcohol and barley. And gets far sicker from drinking beer (two separate allergies) than from wheat beer, hard liquor or wine (only one allergy).
Eating too much of any single food, or repeatedly eating too much of an otherwise very good food at one time, can eventually overwhelm the body's ability to digest it fully. Then, the finest whole food products may set up an allergic reaction. Worse, this allergic reaction itself subsequently prevents proper digestion even when only moderate quantities are eaten.
An allergy may not be recognized as an allergy because it may not manifest as the instant skin rash or stuffy nose or swollen glands or sticky eyes. that people usually think of when they think "allergic reaction." Food allergies can cause many kinds of symptoms, from sinusitis to psychosis, from asthma to arthritis, from hyperactivity to depression, insomnia to narcolepsyand commonly the symptoms don't manifest immediately after eating. Frequently, allergic reactions are so low grade as to be unnoticeable and may not produce an observable condition until many years of their grinding down the vital force has passed. When the condition finally appears it is hard to associate it with some food that has been consumed for years, apparently with impunity.
Thus it is that many North Americans have developed allergies to wheat, dairy, soy products (because many soy foods are very hard to digest), corn and eggs. These are such common, widespread, frequently found allergies that anyone considering a dietary cause of their complaints might just cut all these foods out of the diet for a few weeks just to see what happens. And individuals may be allergic to anything from broccoli to bacon, strawberries to bean sprouts. Unraveling food allergies sometimes requires the deductions of a Sherlock Holmes.
However, food allergies are very easy to cure if you can get the suffered to take the medicine. Inevitably, allergic reactions vanish in about five days of abstinence. Anyone with sufficient self-discipline to water fast for five days can cure themselves of all food allergies at one step. Then, by a controlled, gradual reintroduction of foods, they can discover which individual items cause trouble. See Coca's Pulse Test in the Appendix where you'll find step-by-step instructions for allergy testing that are less rigorous, not requiring a preliminary fast.