A 9-yeаr-оld bоy is brоught to the pediаtriciаn's office by his parents due to concerns about his eating habits. The child is very selective about food, only eating a few types of food, and he shows strong aversion to trying new fooods or textures. The parents report the child has a very limited diet, consisting mainly of plain pasta and chicken nuggets, and he alwasy refuses to eat anything else. The child has lost weight over the past 6months, and his growth has slowed. On physical exam vital signs are within normal limits. He is thin and slightly underweight for his age. Height and weight are below the 10th percentile for age. What is the most likely diagnosis?
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