WASHINGTON -- The first time I ate a nut I was 4 years old. Almost instantly, I felt a tight itchiness in the back of my throat. Eventually, my pediatrician diagnosed it: a tree nut allergy. With each subsequent exposure, my reaction intensified. Eventually, eating errant nuts prompted trips to the emergency room. My mom stocked her purses and my backpacks with EpiPens, Benadryl and bottles of neuroticism.My food allergies aren't -- and weren't -- as severe as those of Tessa Grosso, the young girl profiled by Melanie Thernstrom in last Sunday's New York Times Magazine. Thernstrom details the struggles of Tessa and her own severely allergic son, Kieran, as they attempt to do normal things like go to birthday parties, swim and play with friends at school. The kids are miserable. Tessa, at one point, is so shaken from a reaction that she refuses to eat.Enter Kari Nadeau, an associate professor of allergies and immunology at Stanford University School of Medicine. A few years ago, she developed a special oral immunotherapy treatment to eradicate reactions like anaphylaxis in allergic patients. How does she do it? Nadeau desensitizes allergic kids to allergens through exposure. They begin her clinical trial by consuming a minuscule amount of the allergen. Gradually, after a couple of years of increasing the allergen dose, they're chomping on full servings of the once toxic foods. Nadeau has also discovered she can immunize kids suffering from multiple allergens at once -- which is what she did for Tessa and Kieran.But for me, the revelatory moment of the piece came toward the end. Thernstrom relays happy news: Thanks to Nadeau, Tessa can now tolerate her allergens.And then, in a line that many readers may pass over, Thernstrom exposes a vital truth about those who suffer from allergies. "Profound change is profoundly unsettling," she writes. With the successful treatment, "Tessa lost a defining aspect of her identity."That might be a tough concept for someone without food allergies to grasp. Wouldn't I love, for example, to eat chocolate soufflé at a restaurant without worrying that the cake contains almond extract -- and fearing that the waiter has determined the nut content by peering into the cake's insides? ("It doesn't look like it has nuts!") What if I could stroll into a bakery and select any of the beckoning pastries, regardless of whether the chef made it in a clean bowl?Of course I want those things. But at the same time, I'm grateful for the positive ways my tree nut allergy has defined my identity. It's shaped my behavior in ways that transcend restaurant encounters and transfer to my everyday noneating hours.It has taught me to be assertive and persistent. Restaurant waiters and store clerks are often condescending and flippant when I ask about ingredients. "You're fine," they say with a dry sneer. "I've worked here for a while. I know the menu." At first, I clammed up in response to their dismissiveness; I never wanted to "make a scene." Today, I grill them. I don't care if it's a fancy restaurant or if I'm dining with people I don't know well. A few weeks ago, I was out with my boyfriend at one of Washington's swankier establishments for Restaurant Week. I told the waiter about my allergy and asked that he talk to the chef but got the sense that he didn't really care. (Blank stares and silence are always so reassuring.) I continued questioning him as each dish arrived. As it turned out, several of the dishes he brought me did contain nuts, and he had to sweep them away at the last minute.My nut allergy has also taught me to be my own protector. Family members and friends mean well, but they're fallible. Long-time residents of allergy world have learned, like Dave Navarro, to trust no one. But perhaps the most important skill I've learned in nut world is the ability to relinquish control. Inevitably, even after I cross-examine family members and waiters, each bite is still a risk. By learning to let go, I'm able to enjoy my meal and the company. I refuse to live in a bubble of phobia and fear.