Atopic dermatitis can be caused by several factors, including food allergy. Currently, the diagnosis of food allergy often performing skin tests and measuring specific IgE foods that many studies have shown that about 53% of children with atopic dermatitis have food sensitization, result in avoidance of food intake. But only 15% are confirmed to have a true food allergy, so the purpose of our study is to find the prevalence of food allergy in Thai children with atopic dermatitis who are avoiding some foods, using the oral food challenge to confirm the diagnosis to reduce unnecessary food avoidance and prevent complications from inappropriate dietary restrictions