Delaying Solid Foods May Not Prevent Allergy
Studies Conflict on Whether Delaying Solid Foods in Infants Affects Allergy Risk
March 22, 2004 -- New research challenges the widely held belief that delaying the introduction of solid foods helps reduce an infant's risk of developing asthma and allergies later in life. German investigators found no evidence that this is the case, calling into question expert guidelines recommending such delays in high-risk infants.
But a separate investigation from the U.K. appeared to contradict the German conclusion, finding that preterm infants did seem to benefit from later introduction of solid foods. Both studies are published in the latest issue of the journal Archives of Disease in Childhood.
"The advice of expert committees in the U.S. and Europe to delay the introduction of solid foods to reduce allergy risk is based on very little evidence," childhood allergy specialist Abbas Khakoo, FRCPCH, tells WebMD. "In my mind, the (German) study finding no benefit to such a practice is among the best research that has been done in this area. Given what we know right now, the expert recommendations cannot be justified."
Four percent to 6% of children have food allergies, and according to the American Academy of Pediatrics, the rate of food allergies in children has increased in the past decade. Chicken eggs, cow's milk, peanuts, fish, nuts, wheat, and soy are the most common.
In the German study, 642 children were followed from birth to age 5 1/2. Researcher Anne Zutavern and colleagues found no evidence that delaying the introduction of solid foods helped protect the children against asthma, allergies, wheezing, or eczema.
On the contrary, the researchers found that introducing eggs later in life increased the risk of eczema and preschool wheezing, which is a common predictor of asthma.
The U.K. study included 257 infants born prematurely and studied for a year following their birth. Researchers showed that the introduction of four or more different solid foods prior to age 4 months was associated with a threefold increased risk of eczema.
Morgan tells WebMD that it is probably safe to introduce one or two solid foods that are not linked to allergies prior to age 4 months.