Reactions in those with food allergies can range from mild irritation, such as a slight itch in the mouth, inside of the ears and/or the back of throat, or to severe swelling of the airway, causing a blocked passageway. If not treated, the more serious food reactions can result in death.

One of the most common food allergies is a reaction to peanuts and peanut products. Some people only experience a reaction when ingesting peanuts and products like peanut butter. Those who are more sensitive to peanut products, however, can sometimes experience a deadly reaction when a small portion of powder or oil is present. Many candy companies that include peanut varieties warn that those with severe allergies to peanuts that even non-peanut candies may have traces of peanut products. Many people have allergies to other nuts, such as walnuts, macadamia nuts and almonds.

Gluten allergies are another severe food allergy. People allergic to gluten are unable to ingest products made with gluten. Most foods made from white flour contain gluten. It is extremely difficult for these people to find foods that are safe to eat. There are, however, cookbooks available that give recipes for gluten-free foods. Whole grain breads are an alternative to white bread (which contains gluten).

An allergy to lactose is another difficult food allergy to deal with, as lactose is present in most dairy products. Soy products can help alleviate the inconveniences associated with lactose intolerance.

Some people are actually allergic to raw fruits and vegetables. This is one of the less common food allergies. After cooking the foods, many of the produce that poses a danger raw become safe to eat.

Food allergies are not always present from infancy. They can develop at any stage in life, and for many reasons. Many women find that when they become pregnant, they suddenly develop allergies to new things. The key is to monitor your reactions, and, if you aren't sure how you will react to something, try a very small amount, or avoid it altogether.