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Answers to some frequently asked questions about food allergies. Date published: 2/27/2005
Allergic reactions to foods occur when the immune system identifies a food protein as a harmful substance and attacks it. Some reactions are immediate, while others can be delayed by hours or even a few days. Symptoms can vary and frequently will increase in severity with continued exposure. People just beginning to understand food allergies often find themselves overwhelmed with questions, especially when their children's health is at stake. The following are some of the most commonly asked questions, along with answers whose accuracy was reviewed by local allergy specialist Dr. Seth Craig: What are the symptoms or signs of allergies in infants? Colic, difficulty sleeping, bloating or constant abdominal pain, frequent gas, blood or mucus in the stool, reflux or projectile vomiting, persistent infant acne, eczema, hives and slow growth. Can an allergy be avoided? There is no definitive way to avoid allergies. But doctors recommend that, if there is a family history of allergies, the mother avoid common allergens during the last trimester of pregnancy and while nursing. Doctors also recommend that, when possible, mothers delay the introduction of solid foods and breast-feed exclusively for six months. Breast-feeding not only limits direct exposure to allergens, it also boosts the baby's immune system and allows the digestive system to mature. How accurate are allergy tests? Allergy testing is accurate even in infancy, but at any age, a positive test does not always predict an adverse reaction to actually eating the food. Nor does a negative test guarantee against future reactions. However, tests can frequently offer some needed information and give parents a starting point. The most common initial test is the SPT, in which a small amount of protein is "scratched" onto the baby's skin. The doctor measures reaction based on a histamine control. Another test is the RAST, in which blood is sent off to a lab. Results take approximately one to three weeks to return. If the tests are not completely accurate, how can I identify possible allergens?
1. Be respectful. No personal attacks.
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