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.
More top news
Temperatures near freezing & a slight frost in places tonight
The Cop26 talks were due to be held in Glasgow in November.
The World Health Organization said the number of deaths had doubled in the past week.