Avoidant restrictive food intake disorder (ARFID) was recently characterized, according to the DSM-5 classification, as a feeding and eating disorder (FED). However, ARFID remains poorly known by most pediatricians, but also by psychiatrists and primary care professionals. Despite the fact that patients with ARFID generally have a higher BMI than patients with anorexia nervosa, our purpose was to highlight the fact that they may present severe nutritional deficiencies and major somatic complications when the diagnosis is delayed.