The aim: To determine of the nutrition peculiarities in children with ASD. Materials and methods: The study involved 37 children with ASD from 2 -12 years and thier mothers, in according to reveal its disorder effect on the clinical course of ASD in children. Results: It was shown role of irrational nutrition of the mother during pregnancy, peculiarities of family food traditions, problems of breastfeeding and com¬plementary feeding. Eating behavior of mothers during pregnancy were: monotonous nutrition and an inadequate diet. The family food preferences were: varied and included both traditional and specific food preferences ( vegan, vegeterian, monotony diet). Conclusions: The analysis of the eating behavior in the ASD children, taking into account the age peculiarities, was carried out. Intolerance to certain products was noted. Also effectiveness of the elimination diet was shown. Elimination from the diet of the white flour products within 6 months has a positive result which evaluated by digestive and cognitive signs.