The more often you eat a food, the more likely you are to become allergic to it.  Breastfeeding, delayed introduction and variety help reduce the risks of food allergies. 

Most kids outgrow their food allergies by the time they are three. Early reactions to foods like tomatoes, milk and soy products tend not to persist.

Other reactions to foods like nuts and shellfish do tend to stick around.

 From: A Child grows in brooklyn.com