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What Foods Are You Allergic To?

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Your Food Concerns Answered

Q. Why is there a sudden rise in the number of people diagnosed with celiac disease and food allergies?
A.
There's a laundry list of possibilities, from the ways food is processed nowadays to having an imbalance of folate in our diets. None have been proven and all could play a role. One leading theory is the hygiene hypothesis: "We live in too clean an environment, so our immune systems are not being exposed to and stimulated by bacteria the way they once were," explains Robert Wood, M.D., chief of pediatric allergy and immunology at the Johns Hopkins Children's Center in Baltimore. "The result may be developing an allergy."

Q. Does celiac disease affect only your gut?
A.
No. It's associated with easy bruising, mouth ulcers and anxiety. In adults, it can lead to weight loss, infertility, osteoporosis, rashes, neurological problems and an increased risk for other autoimmune disorders. In children, celiac disease may compromise growth when gluten negatively impacts hormone levels, and even lead to epilepsy, notes Joseph Murray, M.D., a gastroenterologist who specializes in treating celiac disease and a professor of medicine at the Mayo Clinic in Rochester, Minnesota.

Q. Is the food manufacturing industry jumping on the celiac disease bandwagon by adding gluten-free labels to items that don't normally contain gluten?
A.
The market for gluten-free foods and beverages—which are three to four times more expensive than those not marked so—reached $4.2 billion in 2012 in the U.S. and is growing. But experts say the labeling isn't a manipulation tactic. "If you have celiac disease, you have to be on top of everything—and you wouldn't believe the kinds of stuff they put gluten in these days," says Kelly Dorfman, M.S., a nutritionist in North Potomac, Maryland, and author of Cure Your Child with Food. That list includes not just surprising foods (like salad dressing) but even makeup. "I advise people with celiac disease to check that their lip products don't contain gluten," Dorfman says, "otherwise you may ingest it."

15 million adults and children in the U.S. have a food allergy—and an increasing number of kids have more than one.

Q. When you have a reaction to a food, does that mean you're allergic to it?
A.
Not necessarily; it could be an intolerance. Also, there are many different types of food allergies. With a common one called oral allergy syndrome, a protein shared by pollen and certain raw fruits and vegetables may negatively affect your body year-round. If you're allergic to ragweed, you may develop itching in your lips or throat after eating bananas, melons, cucumbers or zucchini. An allergy to pollen from birch trees means you may have a similar physical response when eating apples, peaches, pears, kiwis, plums, cherries and carrots. Should you have an exercise-induced food allergy, which is less common, you can develop hives or feel light-headed when you work out soon after eating a trigger food such as crustacean shellfish, alcohol, tomatoes, cheese or celery.

Q. What's the best way to check for food allergies?
A.
A thorough medical history, blood test and skin-prick test are all important. But the most definitive way is the oral food challenge: Small, gradually increasing amounts of the suspected food are consumed under a doctor's supervision. If an allergic reaction occurs, an antihistamine or epinephrine injection is likely administered, says Wesley Burks, M.D., professor and chair of pediatrics at the University of North Carolina in Chapel Hill. "The oral challenge can also reveal if you've outgrown your food allergy."

Q. Are there other options for treating food allergies besides avoidance and epinephrine?
A.
Fortunately, new and better therapies are being developed and will hopefully become available in the next 10 years. Some researchers are studying oral immunotherapy (also called desensitization), which involves eating minute portions of the food you're allergic to with incremental increases over time as a way to build up tolerance. ("Do not try this at home!" Dr. Sicherer warns. It's risky and should be done only in carefully supervised clinical trials.)

Julia Grumbine, now 14, had a life-threatening allergy to milk. After participating in a desensitization study at Johns Hopkins—in which she was carefully monitored as she ingested tiny amounts of milk with incremental increases over time—she was slowly cured of her allergy. "This has been tremendous for her," explains her mother, Lisa Grumbine, 46, a lawyer in Wilmington, Delaware. "She began to have a better social life, since every kids' party involves pizza and ice cream."

In addition, researchers are working on a peanut allergy vaccine and a skin patch to prevent reactions. "We're hopeful easier approaches will emerge to teach the body to tolerate these foods," says Dr. Wood. Until scientists are able to pave a pathway to fearless eating, vigilance remains our best defense.

Originally published in the August 2013 issue of Family Circle magazine.