A study done in Stockholm looked at overall diet patterns versus specific foods in association with allergies in babies. Babies who ate a steady diet rich in healthy, often homemade foods including fruits and vegetables, fresh poultry and fish rather than those who were fed a diet of processed and packaged foods were less likely to develop food allergies.
The reason may be due to the antioxidants, fatty acids and vitamins and minerals in wholesome rather than processed foods such as pre made meals, deli meats and packaged snacks. It is believed that nutrients educate the immune system and if a baby is lacking in these at any early age then allergies may be more prevalent. There may also be no evidence that avoiding allergenic foods such as eggs, fish, milk or nuts prevent allergies in an infant.