If you have digestive distress after eating, you're probably quick to blame milk products, or perhaps getting more fiber than you're used to. But if your meal contained fruit or fructose (a sugar that's often used as a sweetener), you could be fructose-intolerant, a University of Iowa, Iowa City, study found. Right now, the only remedy for the gas, bloating or abdominal pain is cutting back on the offending fruit. And if your mouth tingles, itches or swells after biting into fruits and veggies, you may have "oral allergies"; up to 75 percent of people who are allergic to tree or grass pollen do. That's because the same proteins that cause pollen allergies are also found in other plants. Unlike severe, life-threatening reactions to shrimp or peanuts, oral allergies are "mainly uncomfortable, not harmful," says Scott Sicherer, M.D., of the Mount Sinai School of Medicine in New York City.