Why bring someone struggling with anorexia into the house?

From Nikki Grahame's wikipedia page:

https://en.wikipedia.org/wiki/Nikki_Grahame#Big_Brother_16

"Grahame spent some of her childhood and most of her adolescence in psychiatric hospitals, suffering from eating disorder anorexia nervosa, a condition that left her comatose and near death at the age of 12.

[...]

Nikki's disorder continued to escalate until her parents had her admitted to the children’s eating disorders unit at the Maudsley psychiatric hospital in London. She was then transferred to Collingham Gardens child and family psychiatric unit in west London, where her weight was increased and after eight months she was allowed home. She was readmitted to Collingham Gardens for six months and then to Great Ormond Street Hospital in London where she was placed on a psychiatric and eating disorders ward.

[...]

During her stay in the Big Brother house, tabloid newspapers revealed that Grahame had battled with the eating disorder anorexia for the majority of her adolescence, and had attempted suicide by taking an overdose of paracetamol several times. In addition, various behaviour exhibited by Grahame—such as a high susceptibility to cold; eating food with a teaspoon; looking for reassurance about her body shape and an obsessive need for bottled water—have been directly linked to her anorexia.

[...]

Grahame told the media in July 2012 that she had been sectioned in hospital for an unknown amount of time in April 2012 after overdosing on pills in an attempt to stay thin."