Above I have provided the most credible nutrition source, The American Dietetic Association. They have a daily "Tip of the day," I thought I'd share todays:
Food Allergies Are On the Rise
Food allergies affect 4 to 8 percent of children and 2 percent of adults. According to the Centers for Disease Control and Prevention, in the US, food allergy incidence increased by 18 percent from 1997 to 2007. Reasons for this increase range from misdiagnosis to potential increases due to extreme approaches to cleanliness.
Food allergy testing is very clearly defined, but many people are relying more on self-diagnosis based on how they respond to particular foods. While your response to a food is part of the diagnostic process, you should not rely on this alone, just as antigen testing cannot be used alone. Given that a food allergy diagnosis can mean elimination of foods, the potential impact on your nutrition is a concern.
Provided by: http://eatright.org/Public/content.aspx?id=11354