Infant nutrition and allergy.

Over the past several decades, the incidence of atopic diseases such as asthma, atopic dermatitis and food allergies has increased dramatically. Although atopic diseases have a clear genetic basis, environmental factors, including early infant nutrition, may have an important influence on their development. Therefore, attempts have been made to reduce the risk of the development of allergy using dietary modifications, mainly focused on longer breast-feeding and delayed introduction or elimination of foods identified as potentially most allergenic. Recently, there is also an increasing interest in the active prevention of atopy using specific dietary components. Many studies have shown that breast-feeding may have the protective effect against future atopic dermatitis and early childhood wheezing. Concerning complementary feeding, there is evidence that the introduction of complementary foods before 4 months of age may increase the risk for atopic dermatitis. However, there is no current convincing evidence that delaying introduction of solids after 6 months of age has a significant protective effect on the development of atopic disease regardless of whether infants are fed cow's milk protein formula or human subject's milk, and this includes delaying the introduction of foods that are considered to be highly allergic, such as fish, eggs and foods containing peanut protein. In conclusion, as early nutrition may have profound implications for long-term health and atopy later in life, it presents an opportunity to prevent or delay the onset of atopic diseases.