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An 8-year-old boy with autism developed a limp and periorbital swelling. He was found to have hypocalcemia and radiographic evidence of rickets. Ophthalmologic examination revealed xerophthalmia and corneal erosions. Serum vitamin A was undetectable and serum 25-hydroxyvitamin D was decreased. Dietary history revealed a markedly altered intake consisting of only french fried potatoes and water for several years. All biochemical and physical abnormalities reversed with appropriate supplementation. The nutritional content of french fries is reviewed. Feeding dysfunction is an integral part of autism and closer attention should be paid to potential nutritional deficiencies.

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