A Swedish clinic says it has developed a highly effective treatment for anorexia and bulimia, eating disorders affecting many thousands of people, especially teenaged girls.

The treatment involves training patients in normal eating habits then making them sit down to rest in rooms with a temperature as high as 104 Fahrenheit.

“Treating anorexic patients with warm temperatures is an old method which was long forgotten in the medical world,” says Per Sodersten, a professor at the Anorexia Center at Stockholm’s Huddinge Hospital.