The case of an 11 years old who is admitted to the pediatric emergency room due to severe dehydration, abdominal pain, vomiting, weight loss, obsessive ideas related to food intake due to fear of vomiting, obsessive concern in relation to food is presented. consumption of some foods rich in carbohydrates for fear of digestive disconfort, denies fear of gaining weight. During hospitalization for severe protein-calorie malnutrition, other non-psychiatric causes are ruled out and the psychiatric evaluation of the child and adolescent obtains characteristic data of autism spectrum disorder and clinical avoidance and restriction of food intake disorder that presented it a lot Previous time, symptoms that went unnoticed despite the decrease in body weight, presenting symptoms of obsessive compulsive disorder (OCD) with a predominance of obsessive thoughts, which aggravated the previous diagnos...