What is "Dangerland" in the novel, Wintergirls?

Dangerland is reaching 85 pounds. 85 pounds was the weight of Lia's body the last time her parents forced her into the hospital. Lia knows that the closer she creeps to that weight, the higher the risk that her parents will realize something is wrong and will return her to the hospital, thus 85 pounds is known as Dangerland.