[custom_adv] Tennis champion Serena Williams is allergic to peanuts. For about 20% of people who develop peanut allergies as children, the allergy goes away as they get older. [custom_adv] Last May, Ariana Grande postponed several concerts on her Sweetener World Tour after suffering an allergic reaction to tomatoes. Her throat "pretty much closed up" and it felt like "swallowing a cactus, the singer wrote on Instagram. [custom_adv] After experiencing internal bleeding in 2006 while filming "Employee of the Month," actress and author Jessica Simpson discovered her allergies to cheese, wheat, tomatoes, hot peppers, coffee, corn, and chocolate. [custom_adv] After getting criticized in April 2012 for looking especially thin, musician Miley Cyrus fired back with an explanation. "For everyone calling me anorexic, I have a gluten and lactose allergy," Cyrus wrote. "It's not about weight it's about health. Gluten is crapppp anyway!" [custom_adv] Singer Kelly Clarkson tweeted in 2013 that she's allergic to "a lot of stuff," including peanuts. "I am now officially going to live in a bubble," the American Idol alum tweeted. "Look out Flaming Lips, I'm stealing your idea!" [custom_adv] "I am the worst person to ever eat with," actress Zooey Deschanel told Vulture in 2011, "because I have all these stupid food allergies."The list is pretty extensive: dairy, eggs, and wheat.