The researchers observed a tenfold difference in the rate of peanut allergies between Jewish children in the United Kingdom and Israeli children. What was one major dietary difference between these two populations of children?

From the study by Krinshaw and colleagues in 2013 titled " Introduction of complementary foods and the relationship to food allergy", it was observed that the major dietary difference is that Israeli children get introduced to peanuts at approximately 7 months of age while the Jewish children are introduced to peanuts at an older age usually above 1 year of age.