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Many people experience unpleasant reactions to foods they have eaten and suspect a food allergy is the underlying cause. However, only 2–5% of adults and 2–8% of children are truly allergic to certain foods. The remainder of people may be experiencing food intolerance, or food sensitivity, rather than true food allergy.
“Masked” or “hidden” allergies are a controversial topic; many conventional doctors believe they are rare, whereas practitioners of alternative medicine believe they are extremely common. According to James Breneman, M.D., former chairman of the Food Allergy Division of the American Academy of Allergy, unrecognized food allergies are responsible for 60% of all of the symptoms seen by a family physician that are not adequately diagnosed or treated.
Food allergies and intolerance are best treated by avoidance of the offending food for a prescribed period of time, followed by a “rotation” diet, in which problem foods are only eaten every three to four days, instead of daily. Young children can often re-introduce foods after three months of avoidance, whereas adults may require six to twelve months of avoidance. Most hidden allergies are cyclic (i.e., they settle down after long-term avoidance). Fixed allergies (those that cause a reaction, no matter how long a time the food has been avoided) are less common.
Symptoms of food allergy or intolerance may not be triggered immediately after reintroduction of the foods; therefore, a person can get an erroneous impression their allergy or intolerance is cured. With repeated ingestion of the food, however, symptoms may gradually return. When a problem food is rotated, symptoms are less likely to return. Some healthcare practitioners recommend rotating food groups (such as legumes every other day) in addition to rotating specific foods. The importance of rotating foods varies from person to person and may be related to the severity of the allergies.
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The information presented by Healthnotes is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. Self-treatment is not recommended for life-threatening conditions that require medical treatment under a doctor's care. For many of the conditions discussed, treatment with prescription or over the counter medication is also available. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements or before making any changes in prescribed medications. Information expires June 2017.