For people with food allergies, vague warnings on food products - such as "may contain nuts" - can be confusing; is the product safe to consume or not? In a new study, researchers claim to have identified the levels at which five common food allergens - peanut, hazelnut, celery, fish and shrimp - cause a reaction in only 10% of people who are allergic to them. Continued at MedicalNewsToday>>