A 5-year-old girl is struggling with a rare and debilitating condition that leaves her ravenous with hunger, according to an ABC News report.

Haley Davis has a condition known as Prader-Willi syndrome. Haley's mother Lisa Davis, who has three other children, knew when her daughter was 18-months-old that something was wrong.

"She was digging through the trash and eating everything, even raw meat," Davis told ABC News. "If we had had yogurt that day, she would lick the empty cup. She was eating butter. Anything she could find."

The Davis kitchen is now under permanent lockdown as Haley continues to struggle with her impulse to eat.

Doctors discovered Prader-Willi syndrome in 1956 and have found that many people with the syndrome are missing the same small stretch of genes on chromosome 15.

Hannah McGee in Dallas suffers from the same debilitating condition. In September, firefighters in Lansing, Mich., used a forklift to rescue a 900-pound man, 33, from his home. The unnamed man, who was in need of medical treatment, also suffered from Prader-Willi syndrome, his brother told the Lansing State Journal.

Click for more on Davis' story from ABC News

Click here to read more on Hannah McGee