The number of young people admitted to hospital suffering from anorexia or bulimia rose by 8% in 2012, according to Government data.
The Health and Social Care Information Centre found most of the 2,560 who went to hospital for inpatient treatment were very young - 15 was the most common age of admission for girls and 13 for boys.
But children aged five to nine and the under-fives were also admitted, they said.
The highest rate of admissions was in the north-east and south-west, where there were 6.5 admissions per 100,000 population, with the lowest rate in the east Midlands, where it was 2.8 per 100,000.
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