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Epidemiological evidence suggests that there is a link between asthma and food allergy. The aim of this study was to estimate the prevalence of food allergy in asthmatic children and to evaluate a possible impact of food allergy on asthma severity. The study enrolled 103 asthmatic children (mean age: 11 years). Skin prick-test, dosage of specific IgE to a standardized panel of inhalant and food allergens and spirometric evaluation was made for each patient. Twenty-four (23%) patients presented food allergy, 75 (77%) were sensitized to at least one food. A lower rate of children with controlled symptoms was found in children with food allergy and a higher rate of persistent asthma was found in children sensitized to at least 4 foods. In conclusion, food allergy/sensitization should always be investigated in asthmatic children for its association with increasing severity (only in food sensitized patients) and reduced control of asthmatic symptoms.