"New Girl" star Zooey Deschanel reportedly has sensitivities to eggs, dairy and wheat, which contains the protein "glue," gluten.

Actress Beverley Mitchell, who played Lucy Camden on 7th Heaven, said her egg and dairy allergies "totally disappeared" when she became pregnant. Her baby is due in April.

"The View" co-host Elizabeth Hasselbeck has celiac disease, a digestive condition caused by an immune reaction to gluten. The "Survivor" contestant wrote a gluten-free survival guide called, "The G-Free Diet," which includes shopping tips, recipes and a restaurant guide.

Actress Halle Berry is reportedly allergic to shrimp, a type of shellfish.

Tennis star Serena Williams is reportedly allergic to peanuts, the most common food allergen among children, according to the American Academy of Asthma, Allergy and Immunology.

Actor Ray Romano reportedly suffers from a peanut allergy.

"Shameless" star Emmy Rossum has celiac disease, a severe intolerance to gluten. Gluten-free dieters can eat fruits, vegetables, meat and a host of gluten-free products made with flour substitutes.

Political commentator Keith Olbermann also has celiac disease, which affects roughly one in 133 Americans, according to the National Institutes of Health.

Clay Aiken is <a href="http://www.timeout.com/newyork/music/clay-aiken"target="external">allergic to tree nuts</a>, which include almonds, cashews, walnuts and pistachios. The singer said he's also allergic to coffee, mints and chocolate.

"New Girl" star Zooey Deschanel reportedly has sensitivities to eggs, dairy and wheat.

Actor and filmmaker Billy Bob Thornton reportedly has an intolerance for wheat and dairy, as well as a shellfish allergy.

New Orleans Saints quarterback Drew Brees reportedly gave up gluten because of an intolerance. He recently raved about a line of gluten-free, dairy-free chocolate bars, tweeting, "Didn't know they could taste so good. Impressed."

Actress Jennifer Esposito suffered through constant stomach pain, weakness and weight loss before being diagnosed with celiac disease, according to her website. She has since founded the Jennifer's Way Foundation for Celiac Education.