121 children under the age of 16 were hospitalised with anorexia last year.
New figures, released under the Freedom of Information Act, show the condition affects far more girls than boys.
A total of 247 people had inpatient admissions in hospital last year, due to either anorexia or bulemia.
237 were admitted with anorexia and 94 per cent of them were female. A total of 121 boys and girls under 16 were hospitalised with this disorder, along with 77 aged between 16 and 24.
There were just 10 admissions with bulimia last year.
The HSE says anorexia has the highest death rate of all mental health disorders.
