The seric levels of IGF1 and IGFBP3 and their molar ratio, together with clinical and auxological parameters, have been evaluated in 16 patients (8 males and 8 females), of average age of 11.6 +/- 8.66 months, who were suffering from complex food allergy and were subjected to a balanced diet will excluded the "offending" food. The results, compared with those of a control population of same age and body surface, have shown a significative reduction of IGF1 and an increase of the molar ratio IGFBP3/IGF1. These observations suggest that, in spite of no significative variation of growth in height and weight, an exclusion diet for a food allergy can reduce the biological activity of some hormonal factors of growth.