Allergy is also caused by food, due to the over reaction of immune system to the food proteins. The immune system produces increased amount of globulin. These react with protein or allergens, and chemicals are released, which result in widening of blood vessel and contract smooth muscles and affect skin areas to become red, itchy and swollen. Allergic reaction to food is rare. Any food can cause allergic reaction. The common food allergens are fish, shellfish, milk, egg, soy, wheat, peanuts, and tree nuts.

Nowadays, most of the people suffer from food allergy or food intolerance, and almost all the people get affected at some point with this allergy. Most of the times, when people eat something, then they feel unpleasant reaction of this food. According to new research, one out of three people have food allergy. Most of the family members also have food allergies and it all happens due to unpleasant reaction of different foods that has necessitated a change in their diet. Another research on food allergies tells that 1% of adults and 3% of children have clinically proved allergic reactions to food.

The treatment of food allergies is also very beneficial and anyone who suffers from allergies can initially stop prevailing allergies. There are many symptoms, which can be seen about the food allergy. Most of the popular food symptoms are nausea, vomiting, diarrhea, and abdominal pain. Incidentally, gastrointestinal symptoms are those symptoms which are most often confused with the symptoms of different types of food intolerance. There are many medications available from the market at discount rates.