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Chapter 2

CHEM 183 Chapter Notes - Chapter 2: Peanut Allergy, Elimination Diet, Lactose Intolerance


Department
Chemistry
Course Code
CHEM 183
Professor
Ariel Fenster
Chapter
2

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CHEM 183 World of Drugs
Midterm 1 MyCourses Reading 2
1. Food Allergy
a. A test called an oral food challenge is the gold standard to rule out an
allergy. It's performed under medical supervision.
i. The purpose of a food challenge is to identify if you are
allergic to a specific food and how much of the food it may
take to cause a reaction.
ii. What they do is give you a really small dose, like a crumb.
Then after 20 minutes or so, if you don't have any reaction,
you can take a dose that's a little bigger. If you can eat an
entire egg, you pass.
b. An estimated 4% of Americans have food allergies, and the Centers
for Disease Control and Prevention has concluded that allergies are a
growing public health concern.
c. About 70-80% of children with an egg allergy will outgrow it.
And about 20% of kids outgrow peanut allergies.
d. Researchers studied the results of about 6,300 food challenges. The
tests were done in adults and children whom doctors suspected had
become tolerant to foods they'd once reacted to.
i. We found that 14% of the patients challenged had mild or
moderate allergic reactions
ii. If the symptoms were treated with just Benadryl or
another antihistamine, they were considered mild or
moderate.
iii. 2% of the reactions were more serious, requiring
treatment with epinephrine.
iv. But the vast majority of patients, 86 percent, did not have an
allergic reaction.
v. Many of the patients in the study may have outgrown their
allergy. "But it's also possible [some of them] never truly had
a food allergy."
1. People sometimes misinterpret the symptoms of a
condition such as lactose intolerance for a food allergy.
e. It can be tricky to diagnose food allergies. That's because the two
main tests doctors use the blood test and the skin prick test
only reveal part of the story. "Both tests only measure sensitization,"
he explains. "All they can tell us is how likely you are to react when
you eat the food."
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