The intensive programme, run by Southmead Hospital's Steps Unit, lasts for 12 weeks and provides clients with support and supervised meals.

There is also a range of psychiatric help to aid sufferers in coping with conditions such as anorexia and bulimia.

Chris Andrews, day therapy co-ordinator at the Eating Disorders Service, said: "You need to be referred by your GP to us.

"I advise anybody who is worried to push hard and try to get treatment.

"It is a huge problem, and is becoming very widespread in society."

One sufferer of bulimia, Victoria, told the BBC she was saved by the programme.

"Before I was referred to the unit I weighed three stone lighter than I do now.

"I don't think I'd be here if it wasn't for the Steps unit, my situation had got that serious."